1) Wide range brass knurled nut embedded insertion tip include M2,M2.5,M3,,M5,M6,M8 to meet your most installation needs 2) Screw installation design easy to change different heat model, no need to the whole tip,just screw off the tip and put on a new one 3) Tip made from brass with high strength and good heat conduction better heat insertion performance to get a smooth and clean insert. 4) Ideal for install heat set insert to 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 this heat-set insert tool kit is designed to turn your ts100/ts101//936 soldering iron into a portable heat insert pressing tool to expand their functions. Colour:Gold & Silver Material:brass Package Contents: 1 * Heat Set Insert Tool Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.