Fangrui Product Details Premium Material: The Threaded Inserts For 3d Printing Are Made Of High Quality Brass, High Strength Without Deformation, Abrasion And Resistance And With Beautiful And Practical, Also Can Withstand High Temperature Above 300c / 572f. Excellent Thermal Conductivity Also Makes Your 3d Printer To Work More Effectively. Multiple Standard Sizes: We Prepare Various Sizes For To Meet All Your Needs. In This Kit, You Get 362pcs M2 M3 M5 M6 Female Knurled Nuts In Different Lengths. Plastic Boxes Are In Any Way, And All Parts Are In Their Compartments To Prevent Mixing During Portation. Firm Hold Easy To Use: These Heat Set Inserts Can Be Widely Used On The Moulding For Tightly Fixing. Can Be Installed By Ultrasonic Or Heat Into Thread Tapered Hole, Or Molded In During . Also Apply To Circuit Board Assembly And In Of Electronics. Using A Normal Soldering Iron, You Could Easily Set Them Into 3d Printed Holes. Threaded Inserts: Deep Thread, Neat And Clean, Not Easy To Strip During Rotation, Stable And Relia