Zinc yellow passivated plated wood screws with a self countersinking head. They have deep sharp threads that cut into the wood and divide the fibres rather than simply forcing their way through, and a penetrating tip requiring no pilot hole or pre-drilling. These screws are heat treated to ensure they are hard and resistant to snapping. Lubricated with a wax coating to minimise heat and aid insertion. For trouble free fastening in soft or hard wood, MDF or chipboard. Precision Pozidrive heads. Volume discounts apply to a mix of these items. N.B 100m and 120mm lengths are partial threaded. Supplied in box quantities of 200 or 500.