2 Pack of 75mm diameter wire cup brushes / wheels. Hexagon shank with M14 x 2 internal thread. Fits any grinder with an M14 thread (Standard 4-1/2" and 9" Grinders) Ideal for polishing metal, removing parint or rust and general metal preparation prior to painting. 25mm Nylon Bristles suitable for wood, metals and non-ferrous metals. Nylon bristles have a much longer life span than wire bristles making this the ideal cup brush for usage again and again. Maximum speed: 12,500 RPM