All Purpose Tapered Grinding Stone 3/16 in. for Rotary Tool

All-purpose tapered 3/16 in. (4.8 mm) grinding stone made from silicon carbide, stronger than aluminum oxide therefor ideal for grinding applications on hard materials such as stone, glass, ceramics, porcelain, precious stones and non-ferrous metals. 1/8 in. diameter steel shank.
Recommended speed:
• Stones and masonry: 20,000 to 30,000 rpm
• Glass and porcelain: 25,000 to 30,000 rpm