Spring loaded "pop-style" cylinder "application engineered" for use in sliding doors. Furnished with two or four #5 wood screws as required. Material : Lock model numbers 1830, 1832 and 2830 include brass cylinders and nickel silver keys. Lock model numbers D3830 and D3832 include zinc die cast cylinders and brass keys. Lock models D6830 and D5830 include zinc die cast cylinders and nickel silver keys. Other parts are plated steel.