Door Thickness - Timber doors: 32 to 50mm, Metal doors: 35 to 50mm. Handing - Reversible Backset - 23mm Standard backset. Extended backsets of 25.4mm, 30mm and 38mm are available on application Case - High purity zinc alloy material cases and aluminium cover plates. Bolt - Latchbolts are 15mm, stainless steel; Cylinder - 5 pin tumbler mechanism. Standard Lockwood oval shaped, Brass cylinders and Brass plugs. Finishes - Chrome Plate, Florentine Bronze, Polished Brass, Satin Chrome