Material: Aluminum oxide.
-Outer diameter: 8mm or 15mm.
-Inner diameter: 6.35mm or 12.7mm.
-Height: approx. 12.8 mm.
-Particle size: 80, 150, 180, 240, 320, 400, 600.

Product Description:
--The grinding cap is made of high-quality aluminum oxide. Sharp and durable.
--The sanding cap is a universal tool that can be used for general sanding, grinding, shaping and finishing. It can be used for sanding interior, exterior, corners and curved surfaces.
--It works well on wood, fiberglass, plastic, rubber and metal.