The Grey Pneumatic 4042RTW is a heavy-duty, professional-grade 1" drive x 1-5/16" thin-wall impact socket. It is engineered primarily for high-torque applications where space constraints around the fastener require a thinner profile than a standard impact socket. Key Technical Specifications Drive Size: 1" Square Drive Socket Size: 1-5/16"Configuration: 6-Point hex opening Wall Type: Thin-wall design Material: Premium Chrome-Molybdenum (Cr-Mo) alloy steel Finish: Black oxide coating for superior corrosion resistance