【SET OF 9 CONCRETE DRILLS】: 5mm. 6mm. 6mm.8mm. 8mm.10mm.12mm.14mm.16mm*160mm; The drilling depth is 100 mm. 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) 【X-SHAPED HEAD】 It features an X-shaped geometry with a cross-spline design for optimal disassembly and ease of use. Fully hardened drill bit with a double flute spiral for efficient waste disposal. 【2 HOLE SHANK】 Round handle two slotted hammer drill bit Regular drilling tools for concrete, granite, stone stone It provides optimal removal of dust and debris with a rounded spiral geometry, more efficiently. 【CARBIDE DRILLS】The drill set is made of high quality carbide steel, durable and rustproof.The tungsten carbide tipped drill head is harder, stronger and more resistant to extreme loads. 【APPLICATION】Suitable for drilling holes in concrete, ceramic tile, tile, stone, wood, aluminium, plastic, concrete and multilayer materials / For all