M-D Building Products 0.625 in. x 20 ft. Gray Foam Backer Rod Weatherstrip for Large Gaps and Joints About This Product 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. Highlights Made of closed-cell foam Use for filling in empty space of large cracks to reduce caulk waste 20 ft. L x 5/8 in. W Gray color Cut to desired length with scissors Indoor or outdoor use Dimensions Product Depth (in.) 240 in Product Height (in.) 0.63 in Product Width (in.) 0.63 in Unspooled Length (ft.) 20 Details Builders Hardware Product Type Foam Tape Color Family Grays Color/Finish Gray Density 15.0 Hardware Color Family Gray Interior/Exterior Interior/Exterior Location Type Multi-Purpose Material Other Returnable 30-Day Single/Double Single Sided