Product Name: Self Clinching Nut Material:carbon steel Color: Black Package Includes: 30 pcs x M3 nut What tool is used to set these: it's a simply press riveting.A any type of M3 screw with a Screwdriver or A plier. for Mass installation ,a Arbor Press is helpful.Embossing Teeth OD: 4.5mm. Processing Suggestions: carbon fiber drones parts's Installation holes should be 4.4mm .. Notice:we have M3,M4,M5 for choice, Please check the size details carefully before you purchase. We accept bulk carbon fiber cnc processing and assembly orders , if any inquiry, please contact with us directly