Master lock Model : K6000BOX . Master Lock Original Key Blanks , 5 Pin , Master/American 6000A Keyway. Ilco M20BR , 1092-6000 Key Blank will also work . Must be sold in quantities of 50 , 50 Keys per box . Works standard American padlocks with an 600A Keyway . Will also work Pro Series padlocks with W600A Option.