Kwikset works hard to understand the world you live in, so that we can do everything we can to protect it. Tustin Lever Vestibule Door Lock with New Chassis with 6AL Latch and RCS Strike Bright Chrome Finish Tustin Lever Vestibule Door Lock with New Chassis with 6AL Latch and RCS Strike Bright Chrome Finish. Our interior and exterior door products provide customers with the quality, technology, durability and style they want while providing the highest level of security..