The 1155-10-AL is a round spacer used for mechanical spacing and component mounting. It is constructed from RoHS-compliant aluminum and features a 5/16 inch outer diameter. This specific model has a length of 1/4 inch and a clearance hole diameter of 0.192 inches, with a length tolerance of +0.010/-0.000 inches. Supplied with a plain finish, these spacers are commonly used to separate or stack printed circuit boards, mount panels, and ensure proper alignment and elevation of components within a chassis.