Good Design: The hole of 3D print nozzle is consistent size and machining, the threads is clean and well formed. The size is clear stamped on the nozzles. Compatibility: Compatible with all 1.75mm ABS/ PLA 3D printer, work well with Monoprice select mini, V5 V6, Prusa i3, Anet8, Anycubic i3 mega, etc. Replacement Nozzle: The 0.4mm M6 3D printer nozzle is a good back up or emergenices when the stock nozzle clog, our copper nozzles produce consistent printing and no clog, give you a smooth and clean printing. Copper Material: The extruder copper nozzle print head is made of durable and solid copper material, not easy get rust or erosion, provide long serivice life. Description: How to replace nozzles ? Step 1: Turn on 3D printer, heat the nozzle and heat block to the target temperature (PLA: 180-220, ABS: 240-280). Step 2: After heat finishing, close printer, take spanner to hold the heat block. Then use socket screwdriver to screw old nozzle extruder out. Notice: Please don't contact the old nozzle and heat block to avoid scalding. Step 3: Spanner keep to hold the hear block, use the socket screwdriver screw the new nozzle in, make sure tight. Specifications: Installation: external M6 thread connection Out Thread: M6 Filament Diameter: 1.75mm Output Diameter:0.4mm Colour: yellow Material: copper Size: 1.25cm long Package Contents: 14 x printer nozzles Notice: Small parts, please keep away from children.Only the above package content, other products are not included. Note: Light shooting 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.