4" x 1/4" x.012", Crimped Wire Wheel, Stem Mounted, Coarse, 1/4" Hex Shank, .012" Wire Size, Designed For Easy Access Into Narrow Holes & Confined Areas, Crimped Style For Light To Medium Duty Applications, Removes Rust, Scale & Paint In Hard To Reach Areas, Use With Any 1/4" Diameter Electric Power Drills Or Pneumatic Drill.