This bosch expert cyl-9 multi construction drill bit is supplied as a pack of 10 bits, each with a 7mm diameter and 100mm overall length. The 7mm diameter suits heavier-duty fixings and larger wall plugs, and with 10 bits per pack, it's a practical choice for contractors and tradespeople working across granite, concrete, brick, soft tile, wood and metal on a regular basis. Delivering up to 5x more precision than the bosch cyl-3, each bit benefits from bosch centering geometry for a steady, slip-free start and a specially designed centring tip that keeps every hole exactly where you intend it. Fine-ground optimised carbide ensures lasting sharpness, and the dust extraction channel promotes efficient, fast drilling throughout. Features and benefits: up to 5x more precise than bosch cyl-3 for professional-grade accuracy bosch centering geometry for a slip-free start and stabilised action precision centring tip for accurate, repeatable hole placement fine-ground high-performance carbide tip for razor-sharp, durable edges optimised dust extraction channel for efficient chip removal and faster drilling cylindrical shank compatible with three-jaw drill chucks specifications: diameter: 7mm length: 100mm pack quantity: 10 contents: pack of 10