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 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! 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 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: Akfldms