Master Lock - (3) High Security Pro Series Keyed Alike Padlocks 6230NKALH-3 w/ BumpStop Technology Three (3) High Security Locks Keyed Alike w/ 6 Keys. ProSeries hardened solid steel body padlocks are designed for Commercial/Industrial applications. These locks feature the BumpStop Advanced Cylinder Technology. (for explanation see more product details below). The same lock with a shorter shackle is also available, search 6230NKA. ATTENTION: If you order two 3-packs they will NOT necessarily be keyed the same. To ensure you get two 3-packs keyed alike, you must order the 6-pack. APPLICATIONS: Industrial and manufacturing environments. it's a popular lock used by business owners to secure their storefronts and business gates. With Marine recreation uses, they will withstand the harsh elements. Utility meters, substations and cable boxes to name a few others. DIMENSIONS: 2-1/2" (64mm) wide round solid steel body, each weighing 1.68 lbs. A 7/16" (11mm) diameter hardened boron alloy shackle with 2" (51 mm) inside height clearance. CHROME rustproofing provides longer life. These high security, rekeyable 5-pin cylinders with spool pins are virtually impossible to pick. And a dual ball bearing locking mechanism resists pulling and prying.