British Standard insurance rated heavy duty 5 lever bathroom lock.Suitable for use with any of our 57mm centre bathroom sprung lever handles.Suitable for use on thirty/sixty minute fire doors.Suitable for use on 30/60 minute fire doors.We recommend using a 3" sash lock with our knob sets.Supplied with matching SS wood screws.Our Black finish is a popular choice in traditional settings. Its subtle sheen offers a bold contrast on stained and painted timber alike. During the manufacturing process, our Black products are baked in a high-temperature oven, giving them durable, corrosion-resistant qualities.Forend Size: 165mm x (L) x 26mm (W) Case Size: 112mm (H) x 17mm (T) Backset: 44mm Centres: 57mm