HI-LO PULLEY 50TBR X 7/8|Hi-Lo's TBR series of pulleys are adjustable center distance drive pulleys that use standard v-belts. The horsepower ranges from fractional to 5HP at 1750 RPM. They have single face movement, which provides greater economy on longer center-distance V-V drives that don’t require absolute belt alignment. Their through bore construction allows mounting from either end. Hi-Lo's torque sensing mechanism controls belt tension with load requirement. They also feature aluminum alloy faces and permanently lubricated moveable face bushings. Stock sizes: 30TBR x ¾, 50TBR x ¾ and 50TBR x 7/8.