Tech-Roll, Inc. manufactures Tech-roll, the hydraulic motorized pulley, and has been doing so since 1998. With the motor inside the drum, it is safe, sanitary, compact, & durable. No external motor mounts, no chain drives, no expensive motor replacements, no outside moving parts, no internal gears or oil bath. Won't overheat with frequent starts & stops, and is cooled by return oil. It is tough, far outlasts other drives and is basically maintenance free. The Tech-Roll is being used in meat, poultry, & fish processing, mobile equipment such as harvesters, baggage loading, sawmills, oil skimmers, underwater treadmills, and many others. It can be used with sprockets, lagged or knurled, and is made of either stainless steel, or carbon steel, from 2.8" to 12.5" diameter. Made in the USA.