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4300 Series Applications Designed for residential or commercial construction Door thickness Fits 35mm to 45mm (1 3/8" - 1 3/4") door thickness (wood or metal door installation) Cylinder The Gainsborough standard brass cylinder features 6 pin tumbler and C4 keyway. Two brass keys supplied as standard. Latch 12mm throw, fire rated. Reversible for right or left handed doors. Faceplate size 57mm x 25mm. Strike 70mm x 28mm x 4mm standard universal strike. Materials Zinc based levers which are plated to match rosette finish. Other parts are made of brass or steel. Door preparation 42mm (1 5/8") cross bore and 23mm (15/16') edge bore.