Product details:

Features: 1" Drive Combination Budd Wheel Impact Socket, 41mm Hex, 21mm Square Transfers the pressure from the thinnest part of the socket wall toward the thicker section, resulting in increased strength. Allows up to 20% more torque to be applied than on standard hex impact sockets. The shift in pressure allows less socket wall thickness, increasing access to tight areas. Sockets grip the fastener across a broader contact area, reducing the chance of rounding off fasteners.