About this item 【9PCS CONCRETE DRILL BIT SET】: 5mm. 6mm. 6mm.8mm. 8mm.10mm.12mm.14mm.16mm x 160mm; The drilling depth is 100mm. With this, you can drill all common dowel holes. (For your machine and personal safety, it is not recommended to use a three-claw impact drill) 【X-SHAPED HEAD】 It features an X-shaped geometry with a cross-flute design for optimal disassembly and ease of use. Fully hardened drill bit with double flute spiral for efficient waste removal. 【2-HOLE SHANK】Double-slot hammer drill bit with round handle Regular drilling tools for concrete, granite, stone It provides optimum dust and debris removal thanks to a rounded spiral geometry, more efficiently. 【CARBIDE DRILL BITS】The drill bit set is made of high quality carbide steel, durable and rustproof. The tungsten carbide tipped drill head is harder, tougher and more resistant to extreme loads. 【APPLICATION】Suitable for drilling holes in concrete, ceramic tiles, stone, wood, aluminum, plastic, concrete and multi-layer