The Terafloat with its turnflex shaft is the ultimate instrument for performing occlusal relief grooves in the treatment of diastemata in cheek teeth and incisors. 
It’s also great for cleaning the black stain off chronically fractured dentine on incisors, canines and cheek teeth to be able to determine if there has been pulp exposure warranting x-rays. 
Terafloat D1-F4 Short Conical Diastema Burr Diamond Coated. 
Screws into Terafloat Head.
Width 4.5mm (0.177 inch) to 5.0mm (0.196 inch), width is slightly variable due to the diamond coating process.
Length of grinding surface 18mm (0.71 inch)