About these itemsQuiet & Efficient Motor: Most use a belt - free direct - drive motor (except SP - 17 - 001 with a belt - driven brushless motor). Running at â¤35 dB, they're quiet, cut belt - related maintenance.Even Polishing: All ensure smooth, shiny results. Some kits come with rough stones for easy gem - making, suitable for all skill levels.Flexible Settings: They have a 1 - 9 - day (or 1 - 240 - hour for SP - 17 - 001) timer and multiple speed levels (4 from 75 - 120 RPM for most, 2 from 34 - 50 RPM for SP - 17 - 001). Overload & power - off memory for seamless operation.High Load Capacity: Barrel capacities range from 1 - 17 lbs. Larger capacities boost efficiency, save time, and reduce refills.User - Friendly & Complete Kits: Easy to use with or without accessories. Some kits include all - in - one items for home or family projects.Key DifferencesModel & MotorKD - C8021, KD - C3021, KD - C3011, KD - C1011, KD - B1031, KD - B3031, KD - B6031, KD - H1011: Belt - free direct - drive.SP - 17 - 001: Belt - driven brushless.Timer & SpeedKD - C8021, etc.: 1 - 9 - day timer, 4 speed levels (75 - 120 RPM).SP - 17 - 001: 1 - 240 - hour timer, 2 speed levels (34 - 50 RPM).Package & StonesKD - B1031, etc.: Include assorted raw stones, abrasives, etc., and a sound - reduction cover.KD - C3011, KD - C1011: Have mixed rough stones and relevant accessories.KD - C8021, KD - C3021: No raw stones, just basic items.SP - 17 - 001: No raw stones, comes with base, barrel, etc.SpecificationsKD - C8021Model: KD - C8021Net Weight: 13.45 lbs / 6.10 kgDimensions (with barrel): 12.2 x 9.06 x 8.66 in / 310 x 230 x 220 mmDimensions (without barrel): 12.2 x 9.06 x 4.33 in / 310 x 230 x 110 mmKD - C3021Model: KD - C3021Net Weight: 7.72 lbs / 3.50 kgDimensions (with barrel): 7.01 x 9.06 x 8.27 in / 178 x 230 x 210 mmDimensions (without barrel): 7.01 x 9.06 x 3.94 in / 178 x 230 x 100 mmKD - B1031Model: KD - B1031Net Weight: 4.34 lbs/1.97 kgDimensions (with barrel): 8.86 x 6.50 x 6.50 inch/225 x 165 x 165mmDimensions (without barrel): 8.86 x 6.50 x 3.15 inch/225 x 165 x 80mmKD - C3011Model: KD - C3011Net Weight: 7.17 lbs / 3.25 kgDimensions (with barrel): 8.66 x 7.09 x 9.84 in / 220 x 180 x 250 mmDimensions (without barrel): 8.66 x 7.09 x 4.8 in / 220 x 180 x 122 mmKD - B3031Model: KD - B3031Net Weight: 5.18 lbs/2.35 kgDimensions (with barrel): 7.60 x 6.22 x 6.02 inch/193 x 158 x 153mmDimensions (without barrel): 7.60 x 6.22 x 2.48 inch/193 x 158 x 63mmKD - C1011Model: KD - C1011Net Weight: 4.56 lbs / 2.07 kgDimensions (with barrel): 6.22 x 7.68 x 6.02 in / 158 x 195 x 153 mmDimensions (without barrel): 6.22 x 7.68 x 2.52 in / 158 x 195 x 64 mmKD - B6031Model: KD - B6031Net Weight: 7.78 lbs/3.53 kgDimensions (with barrel): 10.35 x 7.09 x 8.39 inch/263 x 180 x 213mmDimensions (without barrel): 10.35 x 7.09 x 3.74 inch/263 x 180 x 95mmKD - H1011Model: KD - H1011Net Weight: 3.66 lbs/1.66 kgDimensions (with barrel): 7.60 x 6.22 x 6.02 inch/193 x 158 x 153mmDimensions (without barrel): 7.60 x 6.22 x 2.48 inch/193 x 158 x 63mmSP - 17 - 001Model: SP - 17 - 001Net Weight: 20.72 lbs / 9.4 kgDimensions (with barrel): 12.6 x 14.17 x 10.75 in / 320 x 360 x 273 mmDimensions (without barrel): 12.6 x 14.17 x 4.13 in / 320 x 360 x 105 mmPackage ContentKD - C80211 Rock Tumbler Kit1 User Manual1 AdapterKD - C30211 Rock Tumbler Kit1 User Manual1 AdapterKD - B10311 Rock Tumbler1 User Manual1 Bag of Assorted Raw Stones (1/2 lb/230g)Abrasives & Polishing Compounds1 Strainer, 1 Shaker Ball, Rings, Cord, Base, Adapter, Sound - Reduction CoverKD - C30111 Rock Tumbler Kit1 User Manual1 Bag of Mixed Rough Stones (450 g)Abrasives & Polishing Powder1 Strainer Spoon, 1 Shaker Ball, Ring, Cord, Pad, AdapterKD - B30311 Rock Tumbler1 User Manual1 Bag of Assorted Raw Stones (1/2 lb/450g)Abrasives & Polishing Compounds1 Strainer, 1 Shaker Ball, Rings, Cord, Base, Adapter, Sound - Reduction CoverKD - C10111 Rock Tumbler Kit1 User Manual1 Bag of Mixed Rough Stones (450 g)Abrasives & Polishing Powder1 Strainer Spoon, 1 Shaker Ball, Ring, Cord, Pad, AdapterKD - B60311 Rock Tumbler1 User Manual1 Bag of Assorted Raw Stones (1/2 lb/450g)Abrasives & Polishing Compounds1 Strainer, 1 Shaker Ball, Rings, Cord, Base, Adapter, Sound - Reduction CoverKD - H10111 Rock Tumbler1 User Manual1 Bag of Assorted Raw Stones (1/2 lb/230g)Abrasives & Polishing Compounds1 Strainer, 1 Shaker Ball, Rings, Cord, Base, Adapter, Sound - Reduction CoverSP - 17 - 0011 Rock Tumbler Kit1 Base Unit1 Barrel1 User Manual1 Belt
