Standard Pack = 1 piece(s). Type = Twinpower Adapter ; Diameter = 5/8 Inch ; Thread Per Inch = 11 ; Features = Double Sided Disc That Allows You To Tgrind And Finish Without Having To Move Your Large Work Piece Or Grind From An Uncomfortable Position, Thin Design Allows Access Into Hard To Reach Areas Like Channels Or Underside Of Surfaces ;