◎ Each featuring 2 sizes in one tool
◎ Drop forged chrome molybdenum steel for strength and durability
◎ For use with 1/2 inch drive extended anvil shank impact tools or included 1/2 inch drive x 3 inch extension
◎ Thinner walls provide better access in tight areas
◎ Sizes: 17, 19 & 21 mm, 3/4, 13/16 & 7/8in.