Door weatherstripping: is this slot a kerf or something else?

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I do all my weatherstripping with the RCT slot cutter I love their silicone weatherstrips and sweeps They are a

slot machine tactics The new SRS Hardware KS 01 kerf saw is an invaluable tool for the correct installation of interlocking metal weather-stripping for doors

soccermania slot kerf cut channel About This Item Introducing the GSI Foam-Core Window Kerf Slot Sash Weatherstrip Seal Bulb in a vibrant Bright White color This top-of