Proto J49001CF Crowfoot Socket Wrench Set, 3 8 in Drive, SAE, Open End, 43 PC 459P75 Size 15 in x 150 Size 15 in x 150 ft and multiresidential buildings 21 Anti Slip Design open end (ASD) The arched surfaces are designed to spread the contact forces over a greater area and they keep the loads off the corners of the fastener which helps prevent fastener rounding Additional Features: Broad size range ensures the right tool for the application will be available Typically used in lower torque applications Full polish finish provides corrosion resistance and easy to clean surfaces Country of Origin United States SAE Head Style Open End Material Alloy Steel Standards ASME B107