Proto J49001CF Crowfoot Socket Wrench Set, 3 8 in Drive, SAE, Open End, 43 PC 6B956 Wrench Speed Type Variable Handle Wrench Speed Type Variable Handle Two Handle Set Standards CSA Certified Number of LED Lights 2 Included Fence Yes Minimum Speed 9 Fasteners require a hole in the support structure as well as a threaded stud and hex nut (not included) 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