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How to measure glass! In the glass trade we have a set criteria for measuring glass.
The first being a tight size this is obtained by measuring from wood to wood on your window frame or door frame. The second being a glazing size which you obtain by knocking off 4 to 6mm from the tight size. We recommend knocking off 4mm on small squares up to 250mmx300mm, any sizes above this size we would knock off 6mm If you are not sure of this procedure please measure tight size and state this on your order.
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