Made Of Polycarbonate With Interior Polyethylene Foam Liner. Stainless-Steel Hinge And Latch Pins. Locking Holes: 0.1875" (3/16") Diameter. Waterproof Up To 90 Feet For 30 Minutes. Pressure Release Slot. Utility Mounts To Easily Attach Carabiner or Tether. Integrated Feet Allow For A More Secure Base or Stacking.