These screws with green anti corrosion finish are ideal for DIY (everyday use), professionals, who work in the construction industry; Steel screws with countersunk Torx type heads are a good choice, who are looking for a reliable high quality and sturdy screws Ribs under head for improved countersinking; Self-countersinking heads ensure aesthetic finish result. Type 17 point provides immediate start in all timbers. 100mm Decking Screws SKIR‘CO Pack Of 50 Pcs Green Anti Corrosion Finish 4.0 X 40 Mm Timber Decking Screws Wood Type 17 Countersunk Torx Head 21442 Hex Screws 8 x 1-1/4-in Wood to wood Deck Screws ( 157 -Per Box Suitable for outside usage; Often used in decking applications and also widely used in exterior timber, fencing applications, etc. Suregreen | TIMco Timber Railway Screws Bundle | 6.7mm | Hex Head ✔️ Included suitable Torx type screwdriver bit helps to save your time by using it with cordless drill drivers;