Silver (SES). The Briton 121 Door Closer has a die cast aluminium body with a hardened and ground steel rack and pinion mechanism, ensuring a smooth operation. It also features a durable forged steel screw thread armset and is suitable for regular or transom mounting. The closer is reversible to suit both left handed and right handed door applications and comes complete with a 10 year guarantee.. Matching arm. 10 year warranty. Cost effective door closer. Successfully tested to recommendations of EN1154 & EN1634