Asec dual profile mortice nightlatch case engineered for flexible cylinder compatibility. Features an oval cutout with wrap-around plate secured by three machine screws—easily convert between euro and oval cylinders by removing screws and sliding the plate. Integral knurled wheel roller maintains latch retraction for passage mode, whilst the field-reversible latchbolt and antithrust device suit access control applications. Supplied with box strike, faceplate, fitting instructions with scale template, and all fixings. 48mm centre. 10-year guarantee.