SP Air Corporation SP-1764HD model is a 1/4" super-fast mini impact ratchet wrench. The unit is a reaction free ratchet wrench, so the vibration shock pain from normal air ratchets is not present. Unit specifications include a drive size of 1/4" and bolt capacity of 5/16", a max torque of 55 ft-lbs., a free speed of 700 RPM, a vibration level of 2.4 m/s, and a sound level of 83.6 dB. SP-1764HD was upgraded and increased 30% speed and 30% more power than previous sp-1764. The super-fast mini impact wrench is four times faster than a standard mini ratchet with twice the torque. SP Air Corporation patented reaction-free impact mechanism helps minimize damage to the user's wrist and knuckles. SP Air Corporation is a manufacturer of high quality pneumatic tools with over 30 years of experience. SP Air Corporation distribution extends to over 40 countries worldwide. People buy our tools because they have an excellent reputation for getting the job done. We understand and appreciate the value of your business. That's why we have made it our mission to provide you with reliable, quality pneumatic tools. For more than 20 years, we have provided our products and quality customer support for many automotive and industrial clients.