The Mayhew 32090F is a professional 20 piece pneumatic punch and chisel set for automotive and industrial work. Each tool uses a standard 0.401" shank compatible with most air hammers and zip guns. The set includes punches, chisels, scrapers, cutters, and a replaceable tip hammer system with three hammer lengths and twelve interchangeable tips. Made in the USA from high strength alloy steel with a black oxide finish, the set stores in a custom foam tray for organized tool drawer use. Backed by a lifetime warranty.