The Abloy 350 Sentry Padlock is constructed of chrome plated hardened steel brass.  The shackle is .551" and is case hardened boron steel. All Abloy padlocks use rotating wafer discs instead of pins, this increases security and also resistance to weather and other environmental conditions. See the Measurement tab for padlock dimensions. Features: Chrome plated hardened steel construction Case hardened boron steel shackle Can be Keyed Alike or Keyed Different Available in one inch or two inch shackles Great for marine applications To Increase security and Key Control...Keys are sold separately. After you add this padlock to your Cart, you will then have the opportunity to purchase Keys.   ABLOY LOCKS   "One Key---Many Locks"