International 601DKB-48 Commercial Grade 48" door sweep. Dark Bronze anodized extruded aluminum body with black nylon brush. Synthetic polymer, Poly-amide bristles have excellent abrasion resistance, flexibility and memory. They are moisture resistant and retain insecticides well. These door sweeps have a temperature range -70F to 160F. The brush portion extends 1" below the extruded aluminum base. Screw holes are slotted for adjustment.