Drop forged, heat treated chrome vandium steel
Oil quenched, black oxide finish fir duability
Hole on reducers for locking onto tang drive
Specially designed for use with air tools
Spring loaded ball bearings hold sockets securely
Includes (2) reducers ( 1/2 F to 3/8 M, 3/8 F to 1/4 M) and (2) adapters (3/8 F to 1/2 M, 1/4 F to 3/8 M)