Aluminium. Improves insulation and deflects rain away from the bottom of doors. Compatible with doors with 10 – 15mm clearance. Attaches to bottom of door. Length 914mm. Width: 37mm. Aluminium. Improves insulation and deflects rain away from the bottom of doors. Compatible with doors with 10 – 15mm clearance. Attaches to bottom of door. Length 914mm. Width: 37mm.