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Quick Verdict Order the 4900 heavy duty deadlatch for any high traffic storefront where the latch is cycled all day: it retrofits existing 4510 and discontinued 4700 preparations, so the upgrade needs no new stile cutout. Order the 4510 series standard duty deadlatch when the door sees moderate traffic, when you need the 7/8 in. backset (the 4900 does not come in it), or when the existing faceplate is radius (4511) or bevel (4512). Both accept a… Read more