Material: Aluminum, brass, bronze, stainless steel
Mounting:
Metal and wood door: type 1, 1/4 - 20 x 2 1/4" thru bolt and finish washer (standard 1 3/4" door)
Metal door: type 6, concealed, 1/4 - 20 CH MS
Material Size: 1" dia.
Base: 1" dia.
Projection: 2 3/4"
Clearance: 1 3/4"