The Master Lock no. 6271 Pro series hidden shackle padlock, keyed alike – multiple locks open with the same key – features a 2-7/8in (73mm) wide reinforced die cast body that withstands forcible attacks and a 3/8in (9mm) diameter boron alloy shackle. The lock body conceals the shackle, defeating attempts to pry and cut. Ideal for transportation, vending and industrial applications, the high security, rekeyable 6-pin cylinder with spool pins is virtually impossible to pick. 2-7/8in (73mm) wide reinforced die cast body withstands forcible attacks Pro series padlocks are designed for commercial/industrial applications Lock body conceals shackle - defeats attempts to pry and cut Color/Finish Family: Silver Manufacturer Color/Finish: Silver Series Name: Heavy Duty Shrouded Outdoor Height (Inches): 2.875 Shackle Diameter (Inches): 0.375 Shackle Width (Inches): 1.719 Thickness (Inches): 1.090 Width Measurement: 2-7/8-in Adjustable: No Combination Type: N/A (not combination) Contractor Grade: Yes Dial Count: N/A (keyed lock) For Use with Bikes: No For Use with Laptops: No For Use with Luggage: No Keying Type: Keyed different Keys Included: Yes Lock Material: Zinc Lock Type: Keyed padlock Number of Pins: 6 Package Quantity: 1 Rust Protection: Yes Shrouded Shackle: Yes Use Location: Outdoor Warranty: Limited lifetime Weatherproof: Yes App Compatibility: No Bluetooth Compatibility: No Smart Compatible: No Wi-Fi Compatibility: No Works with Android: No Works with iOS: No CA Residents: Prop 65 Warning(s): No TSA Accepted: No UNSPSC: 46171500