Cisa double-bit key rim locks. Steel case and striker, painted in a metallized, antique bronze colour. Four nickel-plated steel horizontal dead-bolts and two adjustable steel top / floor bolts are locked or unlocked by key from either side. Each 180º turn of the key throws the bolts 10mm. (4 throws = 40mm total bolt projection). Six lever mechanism.Supplied with 3 keys, striker, external key guide, and 2 adjustable vertical steel bolts with top and floor strikers to suite most doors up to 2.8m high.This lock is handed. Please refer to our handing diagram before ordering.