Premium MaterialTungsten carbide with reinforced head, strong tungsten carbide tips. The masonry bits have tough carbide tips that retain their strength and sharpness longer than traditional steel bits and easily drill through a variety of materials. The crosshead designCan effectively prevent damage or cracks to the surface of the material. The tile cutters are clean and smooth, and the lack of broken edges doesn't mean that the slight jitter positioning increases opening speed. Fast, precise and non-staggered drilling. Reinforced U-flute slotThe concrete drill has a special U-flute drill bit design, which makes the chip evacuation smooth and improves the drilling performance. Thread chips, fast drilling. When drilling, the hole does not widen without vibration, strong chip evacuation and fast drilling. Hexagonal shank for quick changeThe 6mm hexagonal shank fits more easily and in safe to all power tools, can firmly hold the drill bit in the electric drill, running more stable. Avoid slipping when drilling. Suitable for most drills, electric drills, hand drills and bench drills Wide ApplicationThe drill is powerful and easy to drill, suitable for glass, ceramic tile, marble, wood, plastic, cement, travertine, ceramic, stone, concrete, brick, hard plastic, garden pots, pickguards, mirrors, windows, stainless steel steel, etc Suitable for DIY and construction/technical use. Meet all your needsPackage includes 7 tile drill bits: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 7 different diamond drill bit sizes, so you can start drilling with the smallest bit and progress to the size you need. . These glass drill bits perfectly adapt to various drilling tasks, high drilling precision. The redesigned cross-shaped tip is easy to position and improves drilling speed. With hard materials, it saves working time. The tungsten carbide tip can easily penetrate various materials. The concrete drill bit is made of premium carbide alloy, higher hardness, more wear resistant than drill bits regular tile, and a reinforced head prevents bit cracking and provides longer life. These bits allow for faster starts and less walking in concrete, brick and block; Wide flute design provides fast dust removal and heat reducing capability. It allows fast drilling in materials such as concrete, brick, ceramic, tile, marble , mirror, thin iron plate, plastic, glass and wood. Our concrete drill bits are designed with unique cross angle and U-shaped drainage groove, fast drilling and smoother, which is great for drilling holes on glass, ceramic, tile, mirror, flower pots, wood, porcelain, brick wall, marble, thin iron plate, etc. . It is also easy to remove chips when working. 1/4" hex shank fits more easily and securely in all power tools; compatible with general electric hand drill ,bench drill with lock in the quick-change chuck. Warm Tips: 1.When drilling fragile objects, the drilling speed is not too high, the pressure should not be too much, so as not to damage the drilled objects. 2.Please spray the drill bit with water to keep it cool when drilling the hard material. 3.Please try to keep the drill vertical to the surface.When used dry, do not overheat or put extra pressure on the bit. 4. Not suitable for hammer drills.When drilling, only use the flat drill function, do not use any impact force. 5.Please change your position when there is reinforced concrete in front of you, otherwise drilling will damage the drilling edge. Including 3mm*83mm-2pcs, 4mm*88mm, 5mm*94mm, 6mm*100mm, 8mm*106mm, 10mm*116mm, 12mm* 128mm, different sizes to meet your daily needs.