SELF-LOCKING GUN HEAD：Comes with 3 gun heads of different metric sizes 10-32 8-32 6-32 .The head has a self-locking function that allows you to quickly assemble and disassemble the mandrels without tools,improve work efficiency, convenient and fast HIGH QUALITY：Rivet nut gun with speed adjust knob, Adjust the size of gas, Effectively adjust the intensity and speed of work.Embedded muffler vent, effective reduction of noise generated during work STURDY & LONG-LASTING：Use of impact resistant steel S2 material connecting rod effectively prevent the connecting rod wear，effectively reduce shaking.High quality rotor, forging with high quality alloy steel, Higher accuracy, strong wear resistance EMBEDDED NOISE REDUCTION SETTING ：The noise generated during work is ≤65db, which effectively reduces the noise generated during work and protects the eardrum of the operator NOTE : This is the tips on the use, please lubricate the screw before use, otherwise it may wear the inner wall of rivnut and cause the screw to jam, check and replace the nut bearing in time in order to prolong the service life Package List:1 * pneumatic rivet nut gun 1 *10-32 gun head ,1 *8-32 gun head,1 *6-32 gun head，1 * Hanging Ring 1*US air inlte Connector 5*10-32replacement mandrel ,5*8-32 mandrel replacement,5*6-32 replacement mandrel1*User manual