The Master Lock no. 6321 Pro series® shrouded padlock features a 2-1/8in (54mm) heavy steel body that withstands physical attack and a 3/4in (19mm) tall, 5/16in (8mm) diameter hardened boron alloy shackle for superior cut resistance. Ideal for transportation and industrial applications, the iron shroud protects the shackle from bolt cutters and a dual ball locking mechanism resists pulling and prying. The high security, rekeyable 5-pin cylinder with spool pins is virtually impossible to pick. Iron shroud protects shackle from bolt cutters Pro series padlocks are designed for commercial/industrial applications 2-1/8in (54mm) heavy steel body withstands physical attack 3/4in (19mm) tall, 5/16in (8mm) diameter hardened boron alloy shackle for superior cut resistance Dual ball locking mechanism resists pulling and prying High security, rekeyable 5-pin cylinder with spool pins is virtually impossible to pick Color/Finish Family: Black Manufacturer Color/Finish: Black Series Name: Professional Series Height (Inches): 2.116 Shackle Diameter (Inches): 0.313 Shackle Height: 3/4-in Shackle Width (Inches): 0.875 Thickness (Inches): 0.68 Width (Inches): 2.125 Width Measurement: 2-1/8-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 Keys Included: Yes Lock Material: Steel Lock Type: Keyed padlock Number of Pins: 5 Package Quantity: 1 Rust Protection: Yes Shrouded Shackle: Yes Use Location: Indoor or Outdoor 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 Warranty: Limited lifetime UNSPSC: 46171500