Marson RN-1 / M39300 manual installation tool is capable of installing all sizes of rivet nuts and threaded inserts up to 1/4-20 and 6mm threads in steel. The RN-1 features a quick-change mandrel and longer handles for improved leverage and an adjustable stroke, positive-stop locking feature. It is ergonomically designed, with a forged, heat treated steel upper handle, precision die-cast body of high-strength aluminum alloy, patented fulcrum pin design, and comfortable hand grips. Supplied with 8-32, 10-24 and 10-32 mandrels and nosepieces. Available in a variety of kit forms that include inserts and mandrel sets. Weight: 1.2 lbs.