Kerr Jet Tungsten Carbide Burs Kerr Jet tungsten carbide burs, for enduring aesthetics, effortless efficiency and precision. Kerr Jet offers a full line of over 300 high quality Operative and Specialty Carbide burs including Trimming and Finishing, Fine Cross Cut, Kriss Kross and Solid Carbide burs to meet all your needs. Kerr Jet carbides go through extensive quality validation to ensure they meet or exceed international standards. Kerr Jet burs are available in a range of head shapes and with patient safety and dentist comfort in mind; all operative carbides are designed to prevent slippage of the tool during even the most delicate cavity preparation procedures. Kerr Jet Operative Burs Kerr operative burs are available in a range of head shapes and with patient safety and dentist comfort in mind, all operative carbides are designed to prevent slippage of the tool during even the most delicate cavity preparation procedures.