[Quality Material] The diamond tip is made of high-quality fine-grained hard alloy. The grain is uniform, durable and wear-resistant and can be used for finishing various metal mold cavities. [Various Shapes Bits] 3 Sets of 30 assorted diamond burs will provide you with a variety of standard forming options in different sizes: ball/cone/spherical apex cone/cylinder/taper tip/needle. [Suitable for multiple materials] Professional 120 grit diamond burs assorted. It is ideal for filing ceramic, granite, tile, glass, gold, metal, plastic, platinum, silver, stone, jewelry, wood and anything with a hard surface . [Wide range of applications] Diamond grinding wheel can improve machining quality, efficiency and finish. Use is simple, practical, safe and reliable. Diamond bur on 3mm diameter shank, compatible with most rotary tools. [Note] It is recommended to use water as a lubricant when using these cutters to prevent dust splashing. The kit comes with compact storage cases to organize, store and transport diamond burs. Features -Assorted shapes and sizes include: ball, cone, spherical top cone, cylinder, cone tip and needle. -3mm diameter shank cutter compatible with most grinders or rotary tools -These tools can easily handle the deposit of hard materials such as glass, ceramic, stone, metal, plastic and wood. -Highly recommended for crafts, hobbies, home repairs, jewelry, lapidary use, modeling and much more