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 ... /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:0.35,0.4,0.5mmST ...