Sanding pads conveniently attach with half turn thread. Can be used for domestic and import vehicles with either front or rear disc brakes. Kit comes complete with a holder and five sanding discs. Nylon, silicon carbide, resin adhesive. Polishing disc size: OD 40mmxthicness 14mm xID 16mm. Plastic tail socket size: 31.8mm. Plastic tail socket thread M22.5, Bottom diameter 20.1x9mm. Max operating speed 15000rpm. Connecting seat length: 74mm. Connecting rod size: 6mm, length: 29mm.