Features and Benefits 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 E4 E5 E6 E7 E8 E10 E12 E14 E16 E18 E20 E22 and E24 Torx Sockets 13 Piece External Torx Set (1/4" 3/8" and 1/2" Dr.) includes: E4 E5 E6 E7 E8 E10 E12 E14 E16 E18 E20 E22 and E24 Torx Sockets packaged on a clip rail