The Brinks Commercial Storeroom Knob always requires a key to open the door from the exterior. The deadlocking latch bolt is operated by the inside knob at all times. Designed with a tubular chassis for light commercial and residential uses. This lever fits doors 1-3/8-in to 2-in thick. It has a 3 hour UL fire rating and exceeds ANSI Grade 2 standards. Brinks Commercial is the pro's choice for commercial door hardware. Equipped with tubular chassis Fits 1-3/8-in to 2-in thick doors with an adjustable latch that fits 2-3/8-in or 2-3/4-in backset Meets ANSI Grade 2 standards and has a 3-hour UL fire rating Tested to exceed 500,000 cycles Non-handed/Reversible Equipped with ANSI F86 which requires key for entry from the outside knob at all times. Color/Finish Family: Chrome Hardware Finish: Satin Manufacturer Color/Finish: Satin Chrome Type: Storeroom door knob Backset Size: Adjustable Bore Size: 2-1/8-in Fits Door Thickness: 1-3/8-in to 2-in Projection Measurement: 2-in Antimicrobial: No Commercial/Residential: Commercial For Use with Bed/Bath: No For Use with Entry Door: No For Use with Hall/Closet: Yes For Use with Mobile Homes: No Interior/Exterior: Interior/Exterior Lock Type: Keyed entry and egress Material: Zinc Package Quantity: 1 Package Type: Single pack Projection (Inches): 2 Re-Key Technology: Traditional Shape: Round Style: Traditional ANSI/BHMA Security Grade: Grade 2 (Better) CA Residents: Prop 65 Warning(s): Yes UNSPSC: 31162800