Features & Benefits: All mechanics need thin wrenches occasionally to work on transmissions gas tanks or changing a wheel on a creeper seat. This intermittent use does not justify the very high price charged by the competition; we offer the only reasonably priced alternative on the market. Made of high strength manganese alloy steel these wrenches are heat treated and tempered to maximize strength. Not for high torque applications. Packaged in heavy duty plastic roll pouch. Sizes: SAE; 3/8" x 7/16" 1/2" x 9/16" 5/8" x l-1/16" 3/4" x l3/16" 7/8" x 15/16" 1 "x 1-1/16" 1-1 /8"x l -1/4". Wrench head thickness: 2.6mm to 3.7mm.