With the depth stop adjustment wheel, you can avoid overtightening and damaging your threads until you have the rotation. To put rivet nuts for make a durable thread in thin-walled or different materials. Easy to use and plastic coated handles for comfortable working Comes with numerous rivets (made of alloy 'aluminum), rivet size: M3 / M4 / M5 / M6 / M8 Ideal for general metal working, electrical parts assembly, channel laying and other operations. About Nut Rivet Tool Gun body material: steel Rivet nut material: aluminum alloy Handle cover material: rubber Color: black and blue Hand tool total length: about 27cm/10.63" About rivet nuts Made from aluminum alloy that provides strength, corrosion protection and long life With an open end, 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 function Size: 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 Inserts