Spare must parts for DIY your FDM 3D printing project or MK4 Hot End repair Part: This is a clone alluminium block for the Hotend assembly dedicated for printers using Nextruder. The extruder heater block was easily completed with heating element, temperature sensor, nozzle adapter and steel nozzle 0.4. The enclosed M3 stud bolts have a Torx drive (TX6) not HEX, so you must use the right tool. Package include: only a aluminum heating block and Enclosed M3 Stud Bolts, but not come with a silicone sock. High Temperature, high precision, stable performance. Note: Slight color difference or discrepancy in kind, does not affect the use Colour:Silver Material:Aluminum Package Contents: 1x Pusa MK4 Nextruder Heaterblock 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.