Features: High quality 3D printer parts, special design for Prusa i3 MK3, 1.75mm filament hotend. For other machines, it can only be used remotely replace with V6. The upgrade heatsink extruder radiator have self-elastic collet clip, which will be more convenient in using. Very practical 3D printer accessories, perfectly matched to your machine. Suitable for 1.75mm Filament. Throat Screw: M7. Specifications: Main Material: Metal Throat Screw: M7 Suitable for: 1.75mm Filament Package Size: 11.5 * 8.2 * 2.2cm / 4.5 * 3.2 * 0.9in Package Weight: 37g / 1.3oz Notes: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. 1-3mm deviation is normal due to manual measurement. Packing List: 1 * Radiator 1 * Collet Clip 1 * Heating Block 1 * Throat 1 * 0.4mm Nozzle 1 * Silicone Sock(Random Color)