HP shank (ISO 104), diameter 2.35mm (3/32"), suitable to all low speed handpiece More than 50 types of nail carbide burs for choices, most popular shapes are included. They must satisfy all your applications of nail beauty and podiatry. Different kinds of cutter types range from super coarse cutters to coarse cutters, medium cutters, fine cutters and extra fine cutters. Special kits of nail treatment are OEM available by your special demands.