The Matco Tools 81-pc Auto Master Tap and Die Set, No. 81MATDS, is a comprehensive, lifetime warranty set designed for technicians and includes automotive-specific sizes not found in traditional 75-pc sets. The 81MATDS features the patented Rapid Select Ratchet, which is designed to quickly change between forward and reverse while using taps/dies without working a switch or flipping the ratchet over. This set is machined from hardened imported Japanese tool steel alloy and includes adjustable tap holders and die holder that feature a 3/4" (19mm) hex shape to be driven by the included ratcheting tap wrench or standard sockets and wrenches. Sizes are roll stamped for legibility and durability.