Master Lock Replacement Shackles are engineered for reliable performance and compatibility across a wide range of Master Lock padlocks, including models 6121, 6830, 6840, 6230, 6321, and more. Available in various shackle diameters (from 1/4″ to 7/16″) and clearance lengths (from 1-1/8″ to 3-3/4″), these shackles are ideal for replacing damaged components or customizing padlocks for specific security needs. With options tailored to fit standard and high-clearance applications, these shackles ensure strong, secure, and long-lasting protection in commercial, industrial, and institutional settings.