Master Lock 4MK Brass Padlock 

• Commercial Grade Padlock Features Protection from Drilling & Prying
  
• 1-9/16" (40mm) Wide Reinforced Laminated Brass Body for Superior Strength
• 3/4" (19mm) Hardened Steel Shackle (9/32" diameter) for Extra Cut Resistance
• Dual Ball Bearing Locking for Maximum Pry Resistance
  
• Non-Rekeyable, 4-pin W1 Cylinder Helps Prevent Lock Picking
• Master Keyed (MK) - Each Lock in the Set Will Have its Own Unique Key, and a Master Key will Open All Locks in the Set. Master Keys (MK) are Sold Separate
  
• Specs_Width: 1-9/32" Wide; A: 9/32" (7mm) B: 3/4" (19mm) C: 5/8" (16mm)
  
• Best Used For: Construction Sites & Equipment; Industrial Storefront and Business Gates and Fences, Tool Cribs; Vending Machines 

For 4MK Extra Cut Keys

Master Keys for 4MK Locks