KN Crowder CT-53 Mortised Automatic Door Bottom – 3’0″ LongCT 53 x 3'0" Anodized aluminum and neoprene construction For mortised mounting inside the bottom of wood doors minimum 1 3 4 thick Extruded aluminum housing measures 15 16 thick x 1 5 8 high; overall housing is 1 9 16 wide including flanges Adjustable plunger with maximum 13 16 drop Supplied pre drilled and furnished with mounting screws Can be shortened up to 6 on the field