These Union (Ex Chubb) 3K74 5 lever mortice sashlocks have a rollerbolt latch making it non-handed and are designed for timber doors up to 50mm thick.
Unlike it's 3K75 counter part, the 3K74 has an anti-drill plate of the sides and has a silver powder coat.
It's 14mm bolt throw brass deadbolts contain hardened steel rollers for resistance against hacksawing.
Supplied with 2 keys and a striking plate.