International 673A-36 Commercial Grade 36" door sweep with concealed fasteners. Clear anodized extruded aluminum body with gray 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 3/4" below the extruded aluminum base. Concealed screw holes are slotted for adjustment.