The Vortex multi-purpose power screws are technically advanced and uniquely designed. These versatile screws have a recessed double countersunk head with sharp milling ribs, a sharp, wide and deep thread featuring Sawfix Technology, and an oblique-angle sharp gash point. Suitable for various uses including tile backer boards, hardwood, MDF, decking, wood to plastic and wood to sheet metal. Supplied in a box of 200 screws.