【9 PIECE 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-jaw impact drill) 【X-SHAPED HEAD】 It features an X-shaped geometry with a cross-fluted design for optimal disassembly and ease of use. Fully hardened drill bit with a double flute spiral for efficient waste removal. 【2-HOLE SHANK】Round Handle Two-Slot Hammer Drill Bit Regular Drilling Tools for Concrete, Granite, Stone It provides optimal dust and debris removal with rounded spiral geometry, more efficiently. 【CARBIDE DRILL BITS】The drill bit set is made of high-quality carbide steel, durable and rust-proof. The tungsten carbide-tipped drill head is harder, stronger and more resistant to extreme loads. 【APPLICATION】Suitable for drilling holes in concrete, ceramic tile, stone, wood, aluminum, plastic, concrete and multi-layer materials 9pcs Masonry