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MEASURE TWO THINGS FIRST: Check the rail length, which is the full length of the metal bar from end to end, and the backset, which is the distance from the face of the faceplate to the centre of the handle spindle hole. Pick the size that matches both. Lengths are 250mm, 400mm, 600mm or 800mm, and the backset is 20mm or 22mm. INLINE GEARBOX, 43MM HANDLE CENTRES: The gearbox sits in line with the rail and takes an espag handle with 43mm screw centres, which is the standard spacing on most uPVC window handles. 16MM FACEPLATE WITH MUSHROOM CAMS: The 16mm-wide faceplate fits the common uPVC window groove. Mushroom cams lock into the keeps on the frame to pull the window shut and hold it closed. WHAT'S IN THE BOX: One espag locking mechanism. Screws, handle and frame keeps are not included, so reuse your existing ones or buy them separately. REPLACE A WORN OR BROKEN MECHANISM: If your handle spins, sticks or won't lock the window, the mechanism inside the frame is usually the cause. Remove the handle, unscrew the old espag, fit the new one in its place and refit the handle.