From The Anvil .5″ Rebate Kit for Deadbolt, Polished Chrome – 51720 POLISHED CHROME

Designed for use when fitting a deadbolt to rebated doors (doors that overlap one another when closed)nnFinish: Polished ChromennDimensions:nnRebate Set: 1/2″ (13mm)nnEasy to fit and suitable for use on doors 40mm to 50mm thicknnIf you are unsure if your doors are rebated, here is a simple way to check: Close the doors and if you can pass a piece of paper through the centre, they are NOT rebatednn