High torque motors are virtually just a regular, internally commutated brushless DC Motors mounted with additional gear mechanism on top, to either boost the torque or to decrease the RPM (Revolutions each and every minute). These DC motors are calm powerful and can be used in several hobbyist and commercial application.
Reducing the RPM whilst maintaining high torque might Stainless Steel Chain require adding up more complex gear mechanism therefore the price of these High torque DC motors mainly depends upon the RPM, torque and quality of the motors.The engine shaft from the bottom motor though a transmission connects the small gear box fixed at its front portion, which generates the required torque while keeping the RPM low, the entire gears and gear heads are doped with thick viscous grease lubricant.
These High torque Motors seriously various RPM’s such as for example, 5 RPM, 10 RPM, 100 RPM, 300 RPM, 1000 RPM and so on. The price of these geared motors is based on the RPM, usually lower RPM costs a lot more than those of higher RPM.
Applications
High torque and low rpm DC motors are perfect for robotic and hobby applications, thought how big is the electric motor is a matter of concern because it is quiet huge in size due to additional gear box but still it would save the trouble and cost of adding exterior gears to the assembly of robots where simply the regular DC motors wouldn’t do well. The High Torque, Low RPM DC motors comes with inbuilt gearbox system providing required torque for your robotic application. Hence these 
motors would be the many favorable choice for the hobbyist robotic tasks and tutorials posted here.