Easy Automatic Rivet Tool provides a modifiable way to fasten firewall additions, off-road modifications, body panels, bicycle attachments, or even metal sheet roofing Make the job of metal fabricating safer and easier. Its a small, hand-operated device that creates a threaded hole for fixings that measure anywhere between M3 to M12.FEATURES Unique spring-loaded innerhex sleeve automatically locks the rotation of hand installed mandrel Made with durable alloy steel withrubberized handles for added comfort especially when used for extended periods Great for sheetmetal fabrication Ergonomic handleswith double compound hinges maximizing leverage and for easy operation. Delicate Shape heavy duty hand riveter is ideal for working in hard-to-reach areas. Great for off-road / Jeep modifications 3/25"(3mm) high-strength carbon steelhandles make the rivet nut gun more sturdy and durable,11 specifications to interchangeable mandrel meet the needs of work 7metricM3 M4 M5 M6 M8 M10 M12 interchangeable mandrel/nose bridge kits in various sizes. The M8 spindle is already on the tool, so the plastic box is empty 4 SAE10-24, 1/4-20, 5/16-18, 3/8-16PACKAGE INCLUDES 1 xPremium Easy Automatic Rivet Tool Set