With ANSI Grade-3, Exceeds 250,000 cycles .The solid zinc alloy and brass for strength and security. No need for professional door fitters, you can do it yourself! Satin Nickel Finish long-lasting product life. Heavy-duty door handle is made of premium quality zinc alloy and brass parts to guarantee rust-free in a high humidity environment. We provide 30-day money back and lifetime warranty. 100% Satisfaction Guarantee for risk-free shopping! Adjustable latch 2-3/8’’ - 2-3/4’’ (60-70mm) backset. Door thickness from 1-3/8’’ to 1-3/4’’ (35-45mm) door knobs.It's a lockset for bedroom door with ANSI-3 standards that don't need keys. The privacy door levers can be locked by twisting the button inside and opened outside in case of emergency with a flat-tipped tool such as a screwdriver or coin, ideal for use with bedrooms, bathrooms or offices, etc. Note：Please carefully confirm the size to meet your needs before purchase,If there is any quality problem with your purchasing, please contact us. Entry Door Lever with Lock and Key,Matter Black Exterior Door Handle for Office and Front Door, Square Style Reverisble Bedroom Door Knobs with Lock