The HiTEC HS-645MG Metal Gear Servo provides high torque and suitable radio control to different types of equipment. It combines a variable scale control line with a portable and convenient design for added functionality. The HiTEC HS-645MG model 32645 is compatible with scales from 1:10 to 1:6. The Servo weighs only 0.15 pounds, with a width of 19.8mm. This metal gear servo fits a range of applications that incorporate radio control.