Made of 304 polished stainless steel, the HS-3 model is designed for medium jobs in 1-2 gal. (4-8 qt.) containers. It easily fits any 1/4" electric chucked power tool. The HS-3 model is designed for a max speed of 800 RPMS. Tools with 450-750 RPMS get the best rate of thorough mixing. Mixers can be permanently installed if desired. WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.