Master Lock Padlock 2 3/4'' Keyed Dual Ballbearing Locking Disk 1Pk The Master Lock Magnum No. M40KA discus padlocks feature a 2-3/4 In. (70 mm) wide stainless steel body for maximum strength, reliability and corrosion resistance. The fully shrouded design minimizes shackle exposure and protects against bolt cutter attacks. The 3/8 In. (10 mm) diameter octagonal shackle is 5/8in (16mm) long and made of Tough-Cut boron-carbide, 50% harder than hardened steel, offering maximum resistance to cutting and sawing. The 4-pin cylinder prevents picking and the dual locking ball bearings provide maximum resistance against prying and hammering. The covered keyway offers maximum weather protection, and reinforced body bumper protects against scratches. The Lifetime Guarantee provides peace of mind from a brand you can trust. Features 2-3/4" 70Mm. Rust-free outer construction. Patented boron carbide shackle 50% harder than hardened steel. Key retaining safeguard insures padlock is not left unlocked. Covered keyway for superior weather protection. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.