For those jobs that require extra torque consider purchasing this 4 to 1 Torque Multiplier to your NSK Emax EVOlution system. NSK Emax EVOlution 4:1 Torque Multiplier provides up to 4 times the torque. The speed will decrease. Instead of the normal 1,000-40,000rpm, you'll experience 250-10,000rpm when using the optional reduction gear / torque multiplier.