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Si alvu upvc window lock gear box
si alvu upvc window lock gear box
Si alvu upvc window lock gear box
The si alvu window lock gear box is available in either a 20mm or 22mm backset which is the measurement from the edge of the cam to the centre of the follower these sizes are also stamped on the gearbox themselves which can hopefully allow you to indentify as to whether this is the model you need the fixing centres for the si alvu upvc window

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