Universal Hardware's commercial standard duty privacy function works great for doors that need to be locked from the inside, and unlocked from the outside in the case of an emergency. Constructed with an all-metal, tubular chassis, this lock is designed for light commercial and residential application. This lock is also versatile and can fit doors from 1-3/8 in. to 2 in. T for commercial and residential use. It meets or exceeds ANSI Grade 2 standards and is ADA compliant.