Screw-Tite 2 PZ Double-Countersunk Thread Cutting Screws 3.5mm x 40mm 200 Pack - Screwfix

Acute tri-lock threadform and shank. Enhanced dual-start with opposing thread gives an easy straight drive. Stick-tite recess for maximum grip between bit and screw. Dowel ream reduces timber splitting. Zinc and yellow-passivated.