【9-PIECE CONCRETE DRILL BITS SET】: 5mm, 6mm, 6mm, 8mm, 8mm, 10mm, 12mm, 14mm, 16mm * 160mm; Drilling depth is 100mm. With this, you can drill all common dowel holes. (For machine and personal safety, the use of a three-jaw hammer drill is not recommended) 【AXE HEAD】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 debris removal. 【2-HOLE SHAFT】Double-flute hammer drill bit with round handle. Regular drilling tools for concrete, granite, stone. Ensures optimal removal of dust and debris thanks to a rounded spiral geometry, more efficiently. 【TUNGSTEN CARBIDE BITS】 The drill bit set is made of high-quality tungsten carbide steel, durable and rustproof. The tungsten carbide tipped drill head is harder, stronger and more resistant to extreme loads. 【APPLICATION】 Suitable for drilling concrete, ceramic tiles, stone, wood, aluminum, plastic, concrete and multi-layer materials / For