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 M14x2 5/8"-112.Abore hole:1/2"(12.7mm) 5/8"(15.8mm) 7/8"(22.2mm)3.Cup color:red, blue,orange,black,zinc plated etc4.wire material:S:steel wire 0.35,0.5mmSS:stainless steel wire:0.35,0.4,0 ...