Stanley Proto J1191T-A 12 Point Ratcheting Box Wrench 1/4 X 5/16 Full polish finish provides corrosion resistance and easy to clean surface Built in retaining ring in each ratchet wheel adds speed and convenience for great accessibility. Modified square open end provides the strongest design with better fastener grip Shorter length for access to confined workspaces. The wrench self-aligns with the fastener.