National Hardware Gallery Series 4" Polished Brass Door Surface Bolt is a solid brass bolt designed for casement windows and French, twin, or Dutch doors. Featuring a polished brass finish, this bolt an extra long throw secured by a tension spring to hold it firmly in position without marring wood surfaces. It includes a concealed base and comes with both universal and mortise strikes for versatile installation options. This durable and elegant surface bolt is available in multiple sizes, including 2", 3", and 4", making it a for enhancing the security and style of your doors. Model Number: N197-988