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The 3922 and 3923 Series Heavy Duty Surface Bolts are manufactured from solid stainless steel, steel, bronze or brass. Furnished with both surface and mortise strike. The NYPV prison version include torx screws along with additional spring and holding power designed specifically for abusive environments like cell doors. The L versions can be locked by a padlock with minimum 1-3/4? shackle. Available in two different sizes, 8? (3922) and 12? (3923), these heavy duty surface bolts can handle any situation.