Constructed of investment cast 316 stainless steel for superior corrosion resistance and durability these surface mounted barrel bolts provide additional security as either a primary or back-up locking system. Ideal for use on doors, gates and cabinets they are appropriate for vertical, horizontal, left or right-hand applications. In vertical use notch in barrel holds bolt in locked position. Installs easily. Countersunk for FH fasteners (not included).