10pcs 1 4" (6mm) Head 1 8" (3mm) Shank D Shape Double Cut Carbide Rotary Burrs Red 100pcs x Hex Socket Self 100pcs x Hex Socket Self Tapping Screws The backdraft damper is used to prevent the backflow of smoke or exhaust gas through air duct when the ventilation fan is off which has high hardness prevents excessive wear
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