9-Piece 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 hammer drill) Carbide Drill Bits: The drill bit set is made of high-quality carbide steel, which is durable and rust-resistant. The tungsten carbide-tipped drill head is harder, stronger, and more resistant to extreme loads; high-density drilling and fast waste removal X-Shaped Head: It features an innovative X-shaped geometry with a unique cross-flute 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-hole drill bit, regular drilling tools in an individual red box for concrete, granite, stone. It ensures optimal dust and debris removal thanks to a rounded spiral geometry, more efficient. APPLICATION: Suitable for drilling holes in concrete,