The PullBolt Face Mount model can be face mounted across door and gate frames. It’s installed using four, through mounted M10 stainless steel screws. The lock bolt slides snugly across into the sturdy keeper housing for optimum security. Like all D&D locks, the PullBolt is made from 316-grade stainless steel, making the device ideal for use in marine and other corrosive environments. The 3/4 inch (19mm) diameter lock bolt has a throw of 1-1/4 inch (32mm), and contains a hardened steel insert to resist hack sawing. It is also resistant to prying, oxyacetylene cutting and bolt-cutting. D&D PullBolt has a standard 6-pin key-in-knob style lock cylinder. This cylinder can be keyed alike, maison-keyed, master-keyed, or it can be replaced with high security cylinders such as Abloy, Assa, Kaba, Medeco, Mul-T-Lock or Schlage Primus......to name a few. The locking mechanism is a deadlock design (not snap lock), which protects the lock from being tampered with, and also assures the system cannot be locked without the key-holders authority. Can be used for left or right handed mounting. Limited Lifetime Warranty!