With the depth stop adjustment knob, you can avoid overtightening and damaging your threads until you have the spin.For setting rivet nuts to make a durable thread in materials thin-walled or different materials.Easy to use and handles with plastic coating for comfortable workingComes with many rivets (made of aluminum alloy), rivet size: M3 / M4 / M5 / M6 / M8Ideal for general operation of metal metals, electrical parts assembly, channel laying and other operations.About Nut Rivet ToolGun body material: steelRivet nut material: aluminum alloyHandle cover material: rubberColor : black and blueTotal length of hand tool: about 27cm / 10.63"About Rivet NutsMade of aluminum alloy which provides strength, corrosion protection and long service lifeWith an open end, a small flange, a round hole, a threaded inner wall and a partial non-slip surface, this flat head nut has a good performance of fastening functionSize: 20pcs x M3 Threaded Rivet Nut Inserts; 20pcs x M4 Threaded Rivet Nuts Inserts; 20pcs x M5 Threaded Rivet Nut Inserts; 10pcs x M6 Threaded Rivet Nuts Inserts; 10pcs x M8 Threaded Rivet Nut InsertsAbout Rivet Mandrels5pcs x Nut Rivet Mandrels: M3/M4/M5/M6/M8