For External Torx Bolts. Includes 10 sizes, E5 through E20. Made of heat-treated alloy steel. Sockets are kept in a convenient vinyl holder. 26770 E-5 #8, 4mm 1/4" drive 26780 E-6 #10, 5mm 1/4" drive 26790 E-7 5/16 stud 1/4" drive 26800 E-8 #12 &1/4", 6mm 1/4" drive 26820 E-10 5/16", 8mm 3/8" drive 26830 E-12 3/8", 10mm 3/8" drive 26840 E-14 7/16", 12mm 3/8" drive 26850 E-16 1/2" 3/8" drive 26860 E-18 9/16", 14mm 1/2" drive 26870 E-20 5/8", 16mm 1/2" drive