The Grey Pneumatic 4124R is a heavy-duty 1-inch drive by 3-7/8 inch standard length 6-point impact socket designed for high-torque industrial and automotive applications. Key Technical Specifications Drive Size: 1" square drive Socket Size: 3-7/8" fractional SAE Configuration: 6-point hex output Length Depth: Standard length (overall length of approximately 4.53 inches) Material: High-quality Chrome-Molybdenum (Cr-Mo) alloy steel Weight: 12.5 to 13.41 lbs Design Feature: Features the GP "High Torque Drive" which shifts pressure away from fastener corners to prevent rounding and increase socket