Aluminium. Improves insulation. Reduces water ingress. Keeps out pests, draughts and noise. Compatible with doors with 25mm clearance. Attaches to bottom of door and floor. Length 914mm. Width: 56mm. Aluminium. Improves insulation. Reduces water ingress. Keeps out pests, draughts and noise. Compatible with doors with 25mm clearance. Attaches to bottom of door and floor. Length 914mm. Width: 56mm.