Samac PST550PP 5x50mm Performance PLUS Screw TUB (450) PST550PP Pozi drive for reliable engagement and improved drive control. Reinforced double countersunk head reduces head breakage and assists countersinking. Self-countersinking ribs for improved countersinking and a flush finish. Waxed zinc and yellow passivated finish for corrosion resistance and reduced torque. Milling tread reduces torque and helps prevent splitting. Serrated thread cuts into wood to reduce splitting and driving resistance. Type 17 cut point reduces splitting and the need for pre-drilling. Supplied with a free Pozi bit in each box. Size: 5 x 50mm. Pack quantity: 450. Vendor: Samac. The Samac PST550PP Performance PLUS wood screw is engineered for efficient, professional-grade fixing in timber applications. Its advanced head design, cutting features and reduced-torque finish help deliver cleaner installation, improved holding performance and a neat flush result. Ideal for trades and demanding DIY use, this boxed quantity provides a dependable solution for high-volume fastening requirements.