·Made of high hardness chrome molybdenum steel for durability 

·Sizes: 1/4",5/16"(8mm), 3/8",10mm, 7/16"(11mm), 12mm, 1/2", 13mm, 9/16(14mm), 5/8(16mm), 17mm, 11/16, 3/4(19mm); 

3/8" drive for use use with flat wrench, pliers, socket wrench, adjustable wrench, Vise-Grip locking pliers, 

hand ratchets or impact wrench guns and air ratchets; 

·The working end has a helical shaped flute to help grip rounded fasteners, round head bolts and pan head screws.