UPVC Screws. Maco Inline Upvc Window Lock Rods 20mm & 22mm Back Set GR1 to GR5. The gearboxes are stamped Maco BS22 ( = 22mmbackset) or alternatively Maco BS20 (= 20mm backset). Backset: 20mm & 22mm. Gearbox Mounted: Inline.
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