Screw Bolts For Wood Hex Head Lag Screws 3/16'' X 1-1/2'' Inch, Stainless Steel Black Lag Bolt Wood Screws 25PCS Black Electroplated Wood Screws - Material: 304 stainless steel - Surface treatment: electroplating. Lag Screws Hex head full thread – Custom Builders Merchants Ltd - The surface of the screw is electroplated and made into Dacromet black. It's used for a wide variety of home and commercial applications. 304 Hex Lag Screws Hex lag screws feature deep wood screw threads and does not accept a nut when securing wood in heavy duty applications Stainless Steel Black Lag Bolts ● Product: - 5/16 x 1-1/2 - Screw diameter: 5/16 Inch - Screw length: 1-1/2''. Full Thread Wood Self Tapping Screw Galvanized Hex Head Lag Wood Screws - Before installing the lag screw, it is best to drill a guide hole beforehand.