Patented bit holding system forces bit surface to opposing side for maximum bit retention - strengthPackaged in patented impact resistant ;slide rail; system Heat treated socket bases for durability and service ability Chrome sockets; S2 and alloy steel bits Includes 1/16; - 1/4; Bit Sockets 10 Piece 1/4; SAE Hex Bit Socket Set includes: 1/16; - 1/4; Bit Sockets packaged on a clip rail.