Hardened steel version suitable for air & battery-powered tools
Sizes (M) 3/8" - 1/2"(F), (M) 1/2" - 3/8" (F), (M) 1/2 - 3/4" (F), (M) 3/4" - 1/2" (F) & (M) 3/4" - 1" (F)