Cr-Mo alloy steel forging, heat treatment, strong and durable
The socket is designed for the 1-1/8" square bolt on DWV (Drain, waste, ventilation) clean-outs,particularly on old 4" cast-iron pipes.This socket, when paired with a pneumatic or electric impact wrench, easily removes even the most stubborn caps. The socket is designed for the 1-1/8" square bolt on DWV (Drain, Waste, Ventilation) clean-outs, particularly on old 4" cast-iron pipes. When paired with a pneumatic or electric impact wrench, this socket easily removes even the most stubborn caps.