Our Inverted Cone 1.80mm Carbide Friction Grip Bur is made from super-hard carbide and is securely brazed onto a 1/16" steel shank. It will withstand extremely high speeds up to 350,000rpm and is designed to get into small spaces.  Measures approx. 3/4" overall length. Its 1/16" shank will fit our GRS #850 Ultra High Speed Rotary Handpiece. When combined with a Reducing Collet, they can also be used with many other handpieces.