Made of 304 polished stainless steel, the HS-2 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-2 model is designed for a max speed of 1200 RPMS. Tools with 450-750 RPMS get the best rate of thorough mixing. Mixers can be permanently installed if desired.