The M-D Backer Rod provides a base for caulking to prevent caulk waste in deeper, larger gaps or joints. Backer rod can also fill gaps to protect the home against drafts, moisture, dust and insects. Can be used in both indoor and outdoor applications. Before installation, cut to desired length by using scissors.. Builders Hardware Product Type: Door Top and Side Seals. Color Family: Grays. Color/Finish: Gray. Door Seal Type: Tubular Gasket. Hardware Color Family: Gray. Interior/Exterior: Interior/Exterior. Location Type: Multi-Purpose. Material: Foam. Product Depth (in.): 0.75 in. Product Height (in.): 0.75 in. Product Length (in.): 240 in. Product Width (in.): 0.75 in. Interior/Exterior: Interior/Exterior. Product Length (in.): 240 in. Location Type: Multi-Purpose. Builders Hardware Product Type: Door Top and Side Seals. Width (in.): 0.75 in