Patented bit holding system forces bit surface to opposing side for maximum bit retention - strength. Packaged in patented impact resistant slide rail system . Heat treated socket bases for durability and service ability. Chrome sockets; S2 and alloy steel bits. Includes 1/8, 5/32, 3/16, 7/32, 1/4, 5/16, and 3/8 Bit Sockets 7 Piece 3/8 Drive SAE Long Ball Hex Bit Socket Set includes: 1/8, 5/32, 3/16, 7/32, 1/4, 5/16, and 3/8 Bit Sockets packaged on a clip rail.