This bosch expert cyl-9 multi construction drill bit is supplied as a pack of 10 bits, each with a 5.5Mm diameter and 85mm overall length. The 5.5Mm diameter is a go-to size for many standard wall plug and fixing applications, and having 10 bits in the pack means you're well prepared for high-volume drilling tasks across granite, concrete, brick, soft tile, wood and metal. Each bit delivers up to 5x more precision than the bosch cyl-3, thanks to fine-ground optimised carbide and bosch centering geometry that eliminates skidding from the very first contact. The efficient chip-clearing flute design keeps drilling fast, clean and consistent throughout the life of each bit. 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: 5.5Mm length: 85mm pack quantity: 10 contents: pack of 10