Vortex® screws are recognised in the industry for their premium quality and tailored product features. Technical advancements combine to provide users with versatility and assurance in almost any application. The recessed double countersunk head increases the strength of the screw beneath the head reducing the likelihood of shearing. Sharp milling ribs under the head assist with effective countersinking eliminating the need to countersink the wood before insertion. The sharp, wide and deep thread, featuring 'Saw Fix' serrated thread technology, enables the screw to power through a wide range of materials quickly and easily.Case contents: 5 x 100mm (80pcs), 5 x 80mm (30pcs), 5 x 70mm (55pcs), 4.5 x 50mm (70pcs), 4 x 70mm (60pcs), 4 x 50mm (75pcs), 4 x 40mm (100pcs), 4 x 30mm (140pcs) and 4 Impact Driver Bits.