This KCK 1:1 speed reducer, 150 1:1 ratio 6ft or right 5"x5"x4" is a gearbox/mechanical drive component. It steps down motor speed and multiplies torque before it reaches the driven load, or guides linear travel within the assembly. Key specifications noted on this listing include 1:1 Ratio. It is commonly in OEM equipment and MRO replacement for mechanical drive systems.
