Master Lock Magnum Padlock SET OF 4 Keyed Alike Locks - Model # M5NKASTSLF-4 Lifetime Guarantee! Eight keys are included with this item. When ordering multiple 3-packs we will automatically key them alike unless requested differently. Commercial MAGNUM locks offer a higher level of weatherability and security for applications in outdoor, corrosive and caustic environments. The locks feature a laminated steel body encased in a stainless steel body cover for maximum strength and weatherability. The huge 3/8" (10mm) diameter octagonal shackle is 1-1/2" (38mm) long and made of chrome-plated boron carbide, 50% harder than hardened steel, offering maximum resistance to cutting and sawing. LOCK BUMPING a surprisingly simple method of breaking in through locked doors and padlocks - is undoubtedly the newest emerging threat to personal property security. And virtually all locks in use today are particularly vulnerable to bumping. Until now. BumpStopTM Advanced Cylinder Technology employs an innovative, patent pending design which utilizes a unique reverse rake tapered driver pin, high performance springs and tightly machined cylinder chambers. During a bump attempt, this design prevents the transfer of force from the bump key to the pins and therefore blocks rotation of the cylinder so that the lock remains locked.

• Keyed Alike 4-Pack featuring BumpStop Technology w/ stainless steel body cover and top and bottom plates for exceptional weatherability.
• 2" (51mm) wide laminated steel body for superior durability.
• When ordering multiple 4-packs we will key them alike. Also available in a 2 and 3-pack. Search #M5NKASTSLF in our store front.
• 1-1/2"L (38mm) x 3/8" thick octagonal BORON CARBIDE shackle is 50% harder than hardened steel.
• Chrome-plated shackle for excellent rust resistance. Superior pry resistance with dual-ball bearing locking.

Keyed Alike 4-Pack featuring BumpStop Technology w/ stainless steel body cover and top and bottom plates for exceptional weatherability.Padlocks Keyed Alike - 4 Pack