Strong and durableThe abrasive heads for rotary tools are made of high quality material. Similar in hardness to white corundum, they are strong, sharp and durable. They are widely used for sanding, polishing stone, glass, metal, stainless steel and gemstones. Unique DesignMade in pointed bullet shape which provides access to tight spaces for other grinding needs. For example, curved, flat and grooved surfaces. Excellent sanding effectAbrasive-mounted stone wheels provide excellent polishing effect on stainless steel and other metals, with little noise and dust. They make objects brighter and cleaner. Universal Shank SizeAluminum oxide abrasive bits with 1/8'' shank. NoteFor your safety, be sure to wear protective equipment. When using the grinding bits, make sure the shank is fully inserted into the chuck and securely attached. Materials: Sand corundum + metal Diameter of shank: 1/8" Product specifications: Cylindrical shape 10mm, cylindrical shape 15mm, bullet shape 10mm14 Pcs each size Package content: 42 pcs Grinding wheels to Grind and Grind in Aluminum Oxide