This Kwikset Tylo 400T series keyed entry door knob, identified by MPN 20511435, is designed for use on exterior residential doors requiring security. It provides keyed access from the outside and features a turn-button locking mechanism on the interior. The knob features a classic bell-shaped design and an Antique Brass finish (US5). Constructed from zinc, the lockset is ANSI/BHMA Grade 3 certified for security. It accommodates standard door preparations with an adjustable backset for 2-3/8" or 2-3/4" and fits door thicknesses from 1-3/8" to 1-3/4". Installation requires a 2-1/8" cross bore and a 1" edge bore. The unit includes a 6AL adjustable latch and a round corner square (RCS) strike plate. It is equipped with a 5-pin cylinder utilizing a KW1 keyway, and many versions incorporate Kwikset's SmartKey Security re-keying technology. The knob has a 1-7/8" diameter and a 2-1/2" projection. Kwikset backs this product with a limited lifetime mechanical and finish warranty.