The knotted twist wire cup brushes are available to fit on portable angle grinders,large ... angle brinders,pneumatic grinders etc. The knotted twist cup brush has different specifications:1.Thread: M14x1.25 M14x1.5 ... .7mm) 5/8"(15.8mm) 7/8"(22.2mm)3.Cup color:red, blue,orange,black,zinc plated etc4.wire material ...