Master Lock No. 6121 Weather Tough Lock 

• Pro Series Locks Designed for Commercial and Industrial Applications
• 2-1/8" (54mm) Wide Heavy Steel Body Withstands Physical Attack
  
• Hardened Boron Alloy Shackle for Maximum Cut Resistance
• Dual Ball Locking Mechanism Resists Pulling and Prying
• Weather Tough Cover Protects Lock from Water, Ice, Dirt and Grime
• Shackle: 1-1/8" (29mm), 1-1/2" (38mm), 2-3/8" (60mm) or 5-5/8" (143mm)
• Cylinder: Rekeyable 5-Pin W6000 Cylinder with Pick-Proof Spool Pins
• Keying:Keyed Different (KD), Keyed Alike (KA) or Master Keyed (MK) 
  
• Available Keyways: Also available with Master Lock W1, W15, W17, W27, W81 & W7000 Keyways (must specify keyway if different from Standard W6000)
• Specs_Width: 2-1/8" Wide; A: 5/16" (8mm) B: 1-1/8" (29mm), 1-1/2" (38mm), 2-1/2" (64mm) or 5-5/8" (143mm); C: 7/8" (22mm)
  
• Best Used For: Severe Use on Construction Sites & Equipment; Security Gates & Fences; Trailers, Trucks & Towing 

For No. 6121 Extra Cut Keys

Master Keys for No. 6121MK Locks