# Best medium grit for rock tumbler step 2 Source: https://tumblegrit.com/best/best-medium-rock-tumbler-grit Publisher: Tumble Grit. Picks are chosen from what each Amazon listing states, not from hands-on tests. Method: https://tumblegrit.com/how-we-pick Medium grit (step 2, 150/220 silicon carbide; some brands sell 120/220) removes the scratches left by coarse grit. It does not reshape the stone, so step 2 is normally run once, for about 7 days, until the stones are smooth and evenly matte. That makes it a top-up purchase: most buyers need it because a four-step kit ran short on one grade. The packs below are single-step medium silicon carbide only. They differ in the stated grading (150/220, 120/220, 180/220 or a straight 150), in weight from 1 lb to 10 lb, and in the container, which several listings do not describe. Grit is used at about 2 level tablespoons per pound of rock, the same as in step 1, so a 3 lb barrel takes about 4 tablespoons per run. This guide compares the listings by grit, material, weight and packaging. Nothing was tested: every detail comes from the Amazon listings. The grit calculator on this site gives exact amounts by barrel size. ## Picks ### 1. Fundamental Rockhound Products: 5 lb 150/220 Medium Rock Tumbling Grit polishing Silicon Carbide 150 220 Grit: 150/220; Material: Silicon carbide; Weight: 5 lb; Container: not stated Five pounds of medium 150/220 mixed silicon carbide, labeled step two. The standard grading in a mid-size pack for anyone who tumbles batch after batch. What the listing offers: - The listing states five pounds of medium 150/220 mixed silicon carbide grit for step two. - The listing describes it as graded grit that is made in the USA. - Listed as suitable for all brands of rock tumblers. Limits to know: - The listing does not say whether the 5 lb ships in a bag, a jar or a tub. - Three short bullets only: no usage amounts or instructions are given. ### 2. Rock Tumbler Grit Step 2, 150 Grit Silicon Carbide Medium Media Refill 5LB Grit: 150; Material: Silicon carbide; Weight: 5 lb; Container: not stated A 5 lb step 2 refill of straight 150 grit silicon carbide. The listing gives a usage ratio, which makes it easier to work out how many batches the pack covers. What the listing offers: - The listing states 150 grit silicon carbide for step 2 medium grinding, in a 5 lb refill. - Gives a usage ratio: about 1 oz of grit per pound of rocks, for up to approximately 80 lb of rocks. - Listed as compatible with most standard rotary and vibratory rock tumblers. Limits to know: - Graded as a single 150 grit, not the 150/220 blend named in most step 2 instructions. - Container type and country of origin are not stated in the listing details used for this guide. ### 3. 10 lbs Tumbler Media Grit,Rock Polishing Grit Media, Works with Any Rock Tumbler, Rock Polisher, Stone Polisher,Medium 120/220 Silicon Carbide Grit, Step 2 for Tumbling Stones Grit: 120/220; Material: Silicon carbide; Weight: 10 lb; Container: Wide-mouth container 10 lb of 120/220 graded silicon carbide for step 2 in a wide-mouth container. A bulk pack for large barrels or for a club or classroom that runs many batches. What the listing offers: - The listing states 10 pounds of 120/220 graded silicon carbide grit, labeled medium. - The listing says the grit is packaged in a wide-mouth container. - Listed for smoothing rock surfaces after initial shaping (step 2), with any brand of tumbler. Limits to know: - 10 lb of medium grit is a lot for a step that is normally run once per batch. - Graded 120/220, not 150/220, and no country of origin or usage amounts are stated. ### 4. MJR Tumblers 120/220 Grit Silicon Carbide Rock Tumbler Grit, Fine Stage 2 Rock Polishing Grit 2 lb, Stone Polishing Compound for Rotary & Vibratory Tumblers, Lapidary Supply Grit: 120/220; Material: Silicon carbide; Weight: 2 lb; Container: not stated 2 lb of 120/220 silicon carbide for the second stage. The listing calls it fine stage 2 grit, but the grading is the medium range used for step 2. What the listing offers: - The listing states 120/220 grit silicon carbide for the second stage of rock tumbling, in a 2 lb size. - Listed as suitable for most rock tumblers, including rotary and vibratory models. - The listing says it is offered by a USA-based, disabled and veteran-owned company. Limits to know: - Graded 120/220, a slightly wider blend than the 150/220 that many step 2 instructions name. - The title calls it fine grit, which can be confused with step 3, and the container is not stated. ### 5. Fundamental Rockhound Products: 1 lb 150/220 Medium GRIT for Rock Tumbling polishing Rocks Silicon Carbide Grit: 150/220; Material: Silicon carbide; Weight: 1 lb; Container: not stated One pound of medium 150/220 mixed silicon carbide. The smallest pack in this guide, sized for topping up a four-step kit that ran short on step 2. What the listing offers: - The listing states one pound of medium 150/220 mixed silicon carbide grit. - The listing describes the grit as graded and made for rock tumbling. - A 1 lb size, the smallest single-step medium pack among the listings compared here. Limits to know: - Only two short bullets: the container and the country of origin are not stated. - At 1 lb it suits a top-up for a small barrel, not a long series of batches. ### 6. 2 LB Rock Tumbler Media Grit Refill, Medium 180/220 Silicon Carbide Grit, Rock Refill Grit Abrasive Media Step 2 Grit: 180/220; Material: Silicon carbide; Weight: 2 lb; Container: not stated 2 lb of 180/220 graded silicon carbide, labeled medium and step 2. A small refill with a narrower, slightly finer grading than the usual 150/220. What the listing offers: - The listing states 2 pounds of 180/220 graded silicon carbide grit, labeled medium. - Listed for smoothing rock surfaces after initial shaping (step 2). - Listed as compatible with any brand of rock tumbler. Limits to know: - Graded 180/220, a narrower and slightly finer blend than the usual 150/220. - The listing does not describe the container or give usage amounts. ### 7. Medium 150/220 Silicon Carbide Grit -4 lbs. Grit: 150/220; Material: Silicon carbide; Weight: 4 lb; Container: not stated 4 lb of medium 150/220 silicon carbide from Twin Pines Trading Post. The grading is the standard one for step 2, but the listing says almost nothing else. What the listing offers: - The listing states 150/220 silicon carbide grit, the grading most step 2 instructions name. - Sold as a 4 lb pack, a size between the small top-ups and the 10 lb bulk pack in this guide. - The title labels it plainly as medium grit, with no other steps mixed into the pack. Limits to know: - The listing has a single bullet: no container, origin or usage details are given. - The listing says nothing about tumbler compatibility or rotary and vibratory use. As an Amazon Associate I earn from qualifying purchases.