Set of 12 Mounted Ruby Crystal Points Fast cutting, tough points and cones for accurate grinding of steel, porcelain and glass, as well as for soft and precious metals. Shapes are securely mounted on 3/32" mandrels for use on flexible shaft machines. Set contains one each of the most popular points: 11-502/1, 11-507/1, 11-508/1, 11-510/1, 11-512/1, 11-513/1, 11-518/1, 11-520/1, 11/524/1, 11-525/1, 11-526/1, and 11-530/1.