The OEMTOOLS 31-pc 3/8" Drive Mechanic's Set, No. 23998, is made with alloy steel that is heat-treated for extra strength and longevity. The set features a Hard Chrome that keeps rust away and won't show prints, the company says. The ratchet has a sealed head and is replaceable. The sockets have a Posi-Grip No-Slip design that provides off corner loading for greater torque and the chamfered ends allow the socket to easily slip over the bolt head. The EVA trays fit securely in a cabinet or toolbox and have sizes etched in them for quick and easy identification. The set includes deep and shallow 6-point sockets, wobble extensions, universal joint, spark plugs and a ratchet.