Master lock Model : K27BOX . Master Lock Original Key Blanks , 5 Pin , Master 27K Keyway . Ilco M16BR , 1092NR Key Blank will also work . Must be sold in quantities of 50 , 50 Keys per box . Works with Master Padlock models , 21,24,24,27,31,101,220 and 230 . Will also work Pro Series padlocks with W27 Option .