Optimaxx PZ Countersunk Flooring Screw packed in a box of 500. Fast starting self-drilling self-countersinking hardened steel woodscrew. No splitting no snapping no pilot hole or pre-drilling needed. Ideal for smaller projects in hardwood softwood PVCu MDF chipboard or sheet material. Requires PZ2 bit. Suitable for screwdrivers combi drills and impact drivers. The Optimaxx wood screws unique features offer genuine application benefits meaning they can be relied on to provide the perfect finish every time.