* Stainless steel plug * 12 degree taper on cylinder head. * Accommodates up to 3/16" thick cam. * Drain holes on the bottom of the cylinder. * Includes: a spring clip, mounting nut and 3 keys. * Lock can withstand 1000 pounds of force applied to the cam. * Will retrofit existing NDCBUs (Neighborhood Delivery Collection Box Unit) with double "D" style cut-out. * Exceeds USPS Specifications