Heat treated, extruded alloy steelBlack oxide finished for durabilityContoured plastic T-handlesIncludes: 3/32"""""""", 7/64"""""""", 1/8"""""""", 9/64"""""""", 5/32"""""""", 3/16"""""""", 7/32"""""""", 1/4"""""""", 5/16"""""""", and 3/8"""""""" wrenches""""