Stanley Proto J1197M 12 Point Ratcheting Box Wrench 19mm X 21mm,Stanley Proto,J1197M" /> 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.