Specification Brand : Master Lock BulletPoint1 : This listing is for four (4) High Security Keyed Alike Padlocks w/ 8 keys. ProSeries Padlocks are designed for Commercial/Industrial applications. Limited Life Time Warranty. The same lock is available with two shorter shackle lengths, search 6121NKALF and 6121NKA. BulletPoint2 : If you order two 4-packs they will not necessarily be keyed the same. To ensure 8 locks are keyed alike please order the 8-pack. BulletPoint3 : These locks feature the BumpStop Advanced Cylinder Technology. (for explanation see more product details below). BulletPoint4 : DIMENSIONS: 2-1/8 wide heavy steel body. A 5/16 diameter hardened boron alloy shackle with 2-3/16 inside height clearance. BulletPoint5 : Ideal for harsh outdoor conditions - exclusive Pro Series Weather Tough cover protects lock from water, ice, dirt and grime. 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. Color : Black ControllerType : Hand Control ControlMethod : application FinishType : Bronze IncludedComponents : 15 x bronze Round-shaped locks + 30 x keys ItemName : Master Lock - Four (4) High Security Pro Series Padlocks 6121NKALJ-4 w/BumpStop Technology ItemPackageDimensions_Height : 21.0058 centimeters ItemPackageDimensions_Length : 11.4046 centimeters ItemPackageDimensions_Width : 14.7066 centimeters ItemPackageQuantity : 1 ItemShape : Round ItemTypeKeyword : padlocks LockType : Key Lock Manufacturer : Master Lock Material : Steel ModelNumber : TSCP4397 NumberOfItems : 15 NumberOfPieces : 4 PartNumber : TSCP4397 ProductDescription : FEATURING BumpStop TECHNOLOGY - 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. BumpStop 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. ProductSiteLaunchDate : 2018-05-30T07:00:00.000Z RecommendedUsesForProduct : Security Size : 4 Pack Style : Compact SupplierDeclaredDgHzRegulation : not_applicable