Features Grooved plate surface promotes faster cut Removable pan for easy cleaning Single tri-knob screw releases pan Pad insert provides polishing capabilities Lightweight for easy mobility and storage Runs quietly Mounting holes for securing unit to work area Heavy-duty cast aluminum construction Bumper ring helps prevent fracturing Description Covington's Vibrating Laps are designed to abrade and polish with minimal assistance. Forget all of the work involved in lapping with the vibrating lap, just load, start, and walk away. The inertia of the heavy rock slab holds the piece relatively still while the lap pan vibrates underneath. This effectively replaces the circular rotation used by conventional lapping machines. Units ship complete with plate, bumper ring, polish pad, instructions, safety demands, and product guarantee. 10 inch Covington's 10-inch Vibrating Lap is the perfect countertop-sized model for working small jewelry-sized pieces of glass and stone. Filling the pan 1/2 to 3/4 full ensures maximum plate surface is used while grinding the pieces in the most efficient manner. 12 inch The 12-inch Vibra Lap is similar to the 10-inch size but has an extra two inches in plate diameter. This allows the user to lap slightly larger pieces or several more small pieces at a time. 16 inch Covington's 16-inch Automatic Vibrating Lap is the most popular size model. This unit is the perfect size for a tabletop or workbench. The 16-inch size will accommodate larger pieces or more small pieces. Complete this unit and have it running immediately with a Lapping Grit Kit.