Pricing mentioned is for EA. Requires a minimum buy of 1 piece. Arbor Diam = 3/8 in ; Length = 4 in ; Speed = 25,000 rpm ; Stem Diam = 1/4 in ; Stem Length = 3/4 in ; Type = Drive Arbors ; Used With = Brush Diameter 4 in. Maximum ; Width = 2 in ; Weight = 1/4 lb ;