Cylinder with 2 keys included. Finish: Satin Aluminum Progressive Hardware R1000 Satin Aluminum Drop Bolt Lock for Revolving Doors and Other Applications. Originally designed for revolving doors, but suitable for many other applications. Turn key 90 degrees and stainless steel bolt drops by gravity, extends 1-9/16". Case is machined from a solid ingot of aluminum. Furnished with cylinder and two keys. Will expect standard mortise cylinder. Case is 5-7/8" x 1-3/4" x 1" ingot aluminum. Stainless steel bolt is 5/8" round. Bolt protrudes 1-9/16".