Flat end taper. The diamond coated head is 1.6mm (0.063") in diameter at its widest point. Head length is 4.0mm (0.157"). Available in a medium grit. Shank is 2.35mm (3/32")in diameter, overall length is 44.5mm. Manufactured for medium speed rotary carving tools (up to 55,000 RPM). Excellent choice ...