Easy to Operate, just drill a hole in the workpiece, assemble the appropriate rivet nut onto the tool, insert it into hole, squeeze and then complete. Especially perfect when the surface in question is too thin to be tapped, or access to the backside is limited. Complete Kit for More Convenient Use, 5pcs high quality Threaded Mandrels with nosepieces: M3/M4/M5/M6/M8, totally 120pcs Ribbed Rivet Nuts, M3(30pcs), M4(30pcs), M5(30pcs), M6(20pcs), M8(10pcs) to Meet Your Various Needs. Labor Saving Design: Tool with Mandrel Knob to easily separate the rivet nut from Riveter after it has been fixed; The Tool Stop Lever limits the opening of handles after the nut has expanded to prevent the thread of the nut from deformation. Comes with a Wrench to hold handles and Adjust Mandrels. All tool and accessories are packed in a Plastic Case with dual clip locks and anti-slip carrying handle for good storage and easy portable use! Note: The Tool Does not apply for Steel Nut, just for Aluminum Alloy Nut (M3, M4, M5, M6, M8) and Iron Nut (M3, M4, M5, M6).