For ease of use and all-round performance, these Screw-Tite wood screws take some beating. They're designed with an innovative Tri-Lock shank and thread - this cleverly combines the benefits of a single and twin thread on the same screw. With 25% less insertion torque, you'll get a fast insertion that eases the strain on your power tool and helps to extend battery life. It won't damage the timber, and ensures a strong and secure fixing - once you've driven it in, the Screw-Tite stays in! Perfect for use in timbers, boards, hard and softwood. Can also be used for sheet steel, plastic, masonry (pilot hole required) and more. Tri-Lock shank - 25% less insertion torque and no timber damage. Fast insertion places less strain on your power tool's battery. Firm and secure fit - once driven in, it stays in. Excellent close-to-edge driving performance. This pack of Pozidriv drive recess double countersunk head wood screws are constructed from a durable case and through hardened, 30mm in length and come partially threaded. They have underhead ribs and come wax coated for lubrication. They're ideal for a range of DIY applications. Multi-purpose screw, works in almost anything: hard & softwood, fibre board, masonry, pvcu, sheet steel and more. Tri-Lock shank means once driven in, will stay in - will not work loose over time. Allows close to edge driving with minimum timber damage. Outperforms all in most applications. The screw of choice for the British woodworking magazine & a prize winner for innovation at the Stutgart Fastener Fair.