Meeco ME5020 Tek Head 20 Pieces Polybag Stove Pipe Anchor ScrewsBlack Oxide Self Drilling TEK head screws. All single wall vent pipe should be screwed together at each joint with a minimum of 3 screws. Self drilling TEK head screws. Black oxide finish. Specifications Item Number ME5020 Brand Name Meeco Series Red Devil Item Weight Pieces 1lbs Size 20 Pieces Product Category Stovepipe Anchor Screws Warranty Limited Lifetime Warranty