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✔Size -- 5pcs/pack, 1/4"(6mm), Diamond Height 8mm, Overall Length 65mm, Diamond Grit #50/60, Core Diamond Drill Bit with Round Shank ✔ WIDE APPLICATIONS - Diamond crown drill bits work great for dry drilling holes in hard porcelain tile, ceramic, bathroom tile, granite and marble, masonry, concrete, glass and hard plastic with ease. Using water could extend the service life ✔ HIGH QUALITY RAW MATERIAL - Use vacuum welding technology, which increases temperature resistance and friction, to make diamond particles better fixed to the steel core, improving performance and service life. Constructed with high quality diamond grain for effortless cutting and enhanced durability in tough applications. High quality core steel body helps to be more efficient and durable, not easy to deform ✔ HIGH PERFORMANCE - Special spiral groove design on the top of the bit helps chip removal, the wax inside the bit is helpful for cooling and lubrication ✔ Machine: suitable for any electric drill, hand drill, bench drill, when using angle grinder, install the angle grinder chuck