This heavy duty professional nutsert tool kit is for efficiently fasten metals, canvas or plastic. It contains ribbed rivet nuts from M3 to M8 (for more info, pls see the package bellow), one hand operation nutsert tool, one carry box. All of these tools are packed in a tool box with tray. Features:1. Made of carbon steel, alloy and aluminum, high strength.2. Range from M3-M8, precise mould.3. Strong mandrels, thicker handle well heat treated.4. Rubber covered handle make the handle softer. Ribbed for better grip and rotation.5. Comes with high quality hand riveting tool gun.6. Case with dual clip locks and anti-slip carry handle, easy to carry with.7. Once the nutsert is set ready, it will be permanent.8. Easy taking single-hand style.Specification:Mat.