Better Performance: Tip head made from brass with high strength and good heat conduction better heat insertion performance to get a smooth and clean insert than the normal soldering iron using M2-M8 Brass Knurled Nut: Wide range brass knurled nut embedded insertion tip heads include M2,M2.5,M3,,M5,M6,M8 to meet your most installation needs Expand for T12/900M Soldering Iron Functions: Include 2 heating tip adapters specially designed to for 936/T12 soldering iron and turn them into a portable heat insert pressing machine tool to expand their functions,Heating tip with thread! Easy to Use: Screw installation design easy to change different head model, no need to the soldering iron whole tip,just screw off the tip head then install the head 3D Printed Parts Essential Tool: Ideal for install brass knurled nut into your 3D printing parts enable you assemble and disassemble your projects easily, but 't ruin or contaminate your part rather than a normal soldering iron tip that either stuck or penatrate the insert hole, Manufacturer: Uxsjakjsd