the sanding head brush 1.the newest style 2.environmental plastic budy and sanding head 3.fit normal female rolor disk the side faceIt is fit normal femal rolox disk holderthere is 2.5" and 3" size Are Great For: - Engine and brake Cylinder - Valve Guides and Bodies - Hydraulic and Pneumatic Cylinder - Valve and Pump Housings - Combustion Chambers - Fiream Chambers - Air Compressors - and more ...