【Robust and durable】The grinding heads for rotary tools are made of high-quality material. They are similar in hardness to white corundum and are strong, sharp and durable. They are widely used for grinding and polishing stone, glass, metal, stainless steel and gemstones. 【Unique design】Manufactured in a pointed ball shape that allows access to tight spaces for other grinding requirements. For example, curved, flat and grooved surfaces. 【Excellent grinding effect】Stone wheels mounted on abrasives provide excellent polishing effect on stainless steel and other metals without causing noise and dust, making objects brighter and cleaner. 【noticed】For your safety, be sure to wear protective equipment. When using the grinding bits, make sure the shank is fully inserted into the chuck and secured.