With the depth stop adjustment wheel, you can avoid overtightening and damaging your threads until the depth is reached. so that you have the rotation.To put nuts in place. rivet to make a durable thread in high-strength materials thin wall or different materials.Easy to install. easy to use and handles with plastic coating for comfortable workDelivered with many rivets (made of aluminum alloy), rivet size: M3 / M4 / M5 / M6 / M8 Ideal for general metal working, parts assembly electrical installations, channel laying and other operations. About Nut Rivet Tool Gun Body Material: Steel Nut Rivet Tool Material: Steel rivet: aluminum alloy Handle cover material: rubber Color: black and blue Total tool length Hand: Approx. 27cm/10.63" About Rivet Nuts Made of aluminum alloy which provides strength, corrosion protection and long life With an open end, Featuring a small flange, a round hole, a threaded inner wall and a partial anti-slip surface, this flat head nut has a good performance of fastening functionSize: 20pcs x nut inserts ;M3 Threaded Rivet Nuts; 20pcs x M4 Threaded Rivet Nuts Inserts; 20pcs x M5 Threaded Rivet Nut Inserts; 10pcs x M6 Threaded Rivet Nuts Inserts; 10pcs x Threaded Rivet Nut Inserts