Tungsten carbide cutter with cross cut Ø 3.1 mm, speed range from 15,0000 - 30,000 RPM, HP shaft: Ø 2.35 mm. Instructions for Use: Use only technically sound and maintained handpieces. Handpiece collets should be cleaned regularly. Instruments must be inserted as deeply as possible. Use eye protection and suction. Before positioning instruments on the work area, rev them up to the desired rotations. Avoid tilting or leverage, this leads to an increased risk of breakage. Inappropriate use leads to negative results and increased risks. Broken or uneven blades cause vibrations, bent or malfunctioning instruments should be removed immediately. Pressure: Avoid excessive grinding pressure. Pressure: 0.2 to 0.5 Newton. Recommended rotation: Not paying attention to the maximum permissible rotations leads to an increased safety risk.