This ANSI Grade 2 Certified Heavy Duty Decorative ball knob passage lockset complements both traditional and contemporary residential interior doors. This set has no thumb-turn lock, ensuring easy opening of doors which never need to be locked. Our Contractor Series features a 1/2-Inch throw latch bolt and is UL listed. These locksets are known for their strength, can withstand heavy usage and are easily installed. The cylindrical housing and interior parts are made of heavy gauge cold rolled steel, zinc plated and dichromatic for rust resistance. The threaded outside rose adjusts for doors 1-3/8-Inch to 2-Inch, while an inside rose ensures there are no exposed screws. The combination wood/metal screws accommodate both wood and metal doors. With a solid brass 6 pin tumbler cylinder and 2-3/4-Inch UL listed backset, you know the quality is great. Includes 2 SC1 keys. The excellent craftsmanship is backed by Legend"s Lifetime Mechanical Warranty and a 10 year warranty on the US3 polished brass finish.