
【SET OF 9 CONCRETE DRILLS】: 5mm. 6mm. 6mm.8mm. 8mm.10mm.12mm.14mm.16mm*160mm; The drilling depth is 100mm. This allows you to drill all common bolt holes. (For the safety of your machine and yourself, the use of a three-prong impact drill is not recommended.) 【X-SHAPED HEAD】 It features an X-shaped geometry with a cross-spline design for optimal disassembly and ease of use. Fully hardened drill with double fluted spiral for efficient waste removal. 【2-hole shaft】Hammer drill with round handle and two slots. Normal drilling tools for concrete, granite and stone. Provides optimal and more efficient removal of dust and dirt with rounded spiral geometry. 【CARBIDE DRILLS】The drill set is made of high-quality hard metal steel, is durable and rust-proof. The drill head with tungsten carbide tip is harder, stronger and more resistant to extreme loads. 【APPLICATION】Suitable for drilling holes in concrete, ceramic tiles, stone, wood, aluminum, plastic, concrete and multi-layer materials 9-piece