9pc hex key set. Best quality chrome nickel alloy steel. Hardened and tempered for maximum life. Ends are beveled, slip easily into screws. Wrenches easily replaced by removing a single bolt; snap into right angle position, can be used at any angle. Folds up like knife. Handle fits the hand; easy-to-grip and turn.For smaller size socket screws: 9 key sizes from .050" thru 3/16" with 3-5/8" long handle. Carded For most commonly used screws: {sub1}No. 20911: 9-in-1, sizes 5/64", 3/32", 7/64", 1/8", 1/64", 5/32", 3/16", 7/32", and 1/4; handle 4-1/4" long Heavy-duty: {sub1}No. 20511: 5-in-1, sizes 3/16", 7/32", 1/4", 5/16", and 3/8"; handle 5-1/4" long No. 20812: 8 key sizes from 3/32" thru 1/4" with 5-1/4" long handle. Carded Metric sets: {sub1}No. 21151: 6-in-1; sizes 3mm, 4mm, 5mm, 6mm, 8mm, 10mm; handle 5-1/4" long {sub1}No. 21171: 7-in-1; sizes 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm; handle 3-5/8" long