Receiver Lock With Removable Cable, Fits Both 1/2" & 5/8" Receivers, Push To Lock Locking Mechanism, Push Lock Body Onto Pin Firmly & Remove Key, Weather Tough Seal & Water Tight Cap Protects Lock From Moisture & Dirt, 4 Pin Tumbler Mechanism Resists Picking, Use For Automotive & Towing Bicycles, Uses Master Lock Key Blank K1box Or Ilco Blank M1 TV #320-952.