The Grey Pneumatic 4044RTW is a professional-grade 1" drive by 1-3/8" fractional standard length thin-wall impact socket. Engineered specifically for heavy-duty automotive and industrial use, its specialized thin-wall design enables high-torque delivery within confined spaces. Key Technical Specifications Drive Size: 1 inch Socket Size: 1-3/8 inches (fractional SAE) Wall Profile: Thin-wall design for restricted clearance areas Material: Premium high-quality chrome-molybdenum (Cr-Mo) alloy steel Heat Treatment: Precision balancing to maximize tensile strength and durability Application: Engineered exclusively for high-torque pneumatic or cordless impact wrenches