With these Spax chipboard screws, you draw timber boards, battens, and frames firmly together without gaps. The 18 mm partial thread pulls wood components tightly against the substructure, while the countersunk multi-head sinks flush into the surface for a clean, splinter-free finish. Thanks to the t-star Plus T20 drive recess, your bit stays firmly seated without slipping or camming out, delivering efficient torque transfer and effortless driving. The Wirox coating provides reliable corrosion protection for interior joinery, cabinetry, and renovation projects. With this pack of 1000 screws measuring 3.5 x 30 mm, you can complete every timber fastening quickly, securely, and with total control.