Master Padlock - High Security Locks #6325NKA - BUMP This listing is for one (1) High Security Keyed Alike Padlocks w/ 2 keys. ProSeries Padlocks are designed for Commercial/Industrial applications. Limited Life Time Warranty. These locks feature the BumpStop Advanced Cylinder Technology. (for explanation see more product details below). DIMENSIONS: 2-3/8in (60mm) wide heavy steel body, each weighing 1.55 lbs. A 3/8in (10mm) diameter hardened boron alloy shackle with 3/4 (19mm) inside height clearance. Solid iron shackle shroud resists harsh physical attacks. The removable cylinder can be replaced or re-pinned. 5 spool pin tumbler cylinder for added pick resistance. Dual ball bearing locking mechanism resists pulling and prying.