Welcome to our SheffLOCK Shop. We have a great selection of approved locks and keys with a £2,000 guarantee.

Measure from the CENTRE of the cylinder fixing screw to both ends of your cylinder - with the internal (blind side) always being 10mm - The external side (key side) varies in length . If the external (key end) protrudes 5mm or more from the handle then reduce this size as the cylinders should fit as flush to the handle as possible.