Grips the fastener across a broader contact area allowing for 15% to 20% greater torque and less chance of fastener rounding Chamfered opening provides faster and easier socket fit over the fastener Socket wall thickness is optimized to provide the required strength while retaining ample access to restricted areas Precision cold formed of high alloy steel for exact, consistent dimensions and greater strength Proudly made in the USA with a lifetime warranty, Weight: 1.28 lbs., Manufacturer: Armstrong