Compatible Models??- The aluminum disc master base plate for Flat Abrasive Wheels/Backer-Disc/Slant Cabber Polishing Machine, for Diamond Flap Lap Wheel. Function??- Aluminum Disc Master Lap Base Plate is used for the tray chassis of grinding disc sandpaper, polishing leather, etc. for angle machine, etc., and the tray for jade and jade polishing and polishing discs. Comfortable to Hold??- Aluminum main base plate with 8" diameter, 1/2" hole, suitable for 1/2" mandrel hole, well made, standard size, plated design, soften sharp edges and avoid hurting hands. Note??- This aluminum support disc has no diamond coating and cannot be directly used for grinding stones/knives/jewels/wood and other belongings, this is an attachment to the grinder and cannot be directly used to grind objects as machine accessories, it acts as a grinder in the grinder Support plate and top surface for grinding paper/disc/pad. Premium??Material - Made of high quality aluminum material, stable, wear-resistant, corrosion-resistant, last longer, more efficient, strong and strong, won't shake or cause any vibration.