Description: Value 2-pack. The Mountain Security single cylinder deadbolt, has a 1 inch deadbolt and is keyed on both sides. It fits all doors 1-3/8" to 1-3/4" thick and has a 2-way adjustable latch that fits 2-3/8" or 2-3/4" backsets. It meets ANSI Grade 3 standards. Deadbolts provide additional security to your exterior knob, lever or handleset and are best for front, back and side doors.