The RE98-RADIATOR-KEY key ring covers two useful functions at once: A heating vent key and a reusable caddy chip are both embedded into the key ring. The design of the caddy chip holder made of solid metal is designed like a screw nut. The surface of the key ring is matt. The caddy chip (iron, nickel-plated) can simply be removed and reinserted after use. The heating vent key fits common heating vent valves. A laser engraving on the caddy chip is your perfect advertising option. REFLECTS® own design metal, matt-silver finish, Split Ring: Ø 35 mm