INNOVATIVE MECHANISM - Toolless operation to change head. The Inner threaded base & hex sleeve firmly lock the mandrel during riveting. STRONG AND DURABLE - The 16inch rivet nut tool is made from thick carbon steel with heat treated, and black phosphating finishing protects against corrosion. U cross-section of arm is of high reliability to prevent getting bent. With designed structure and tough materiels it is sturdy and durable enough for long life performance. VARIOUS USE-CASE SCENARIOS - It provide professional solution for all kinds of riveting cases as metal plate, riveting workpiece, bicycle attachments, car attachments etc. ORGANIZED STORAGE SOLUTION - 1piece rivnut tool, 11pcs interchangable mandrels (including: M3, M4, M5, M6, M8, M10, M12, 10-24, 1/4-20, 3/8-16, 5/16-18 and 1/2-13, each size one piece. Notice: One of them is installed on the product.), 176pcs rivnuts, 1piece spanner, 1piece rugged carrying case to keep all of them organized Name:Rivet Nut Tool Kit Material: Metal Type:Riveting machine Type:Rivet nut Type:Automatic rivet nut pulling machine Color: As Shown Material: Metal Package Contents: 1* Riveting Machine 11* Interchangable Mandrels 176* Nut 1* Wrench 1* Carrying Case Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.