WINSINN Aluminum 2GT GT2 Synchronous Wheel 20 Teeth Bore 8mm 20T Timing Pulley for 3D Printer Width 6mm Timing Belt - RepRap Bowden Prusa I3 Mendel Makerbot Kossel Delta (Pack of 5Pcs)

I probably didnt need to replace the old ones on my neptune 4 pro, but I wanted the shiny! They have worked well and havent had any issues after fifteen to twenty prints now.

Working great just like I need them too. Easy to install for my project. The set screws hold their position well and not have any give to them even after raising them to just about the maximum height you can and tightening them. Will update later if something fails.

These for on my ender 3 V2 z screws. I have dual z screws on mine. My intention was to have a timing belt connecting them. While these worked for that I haven't found the correct belt yet. These will work when I find the belt though.

These worked out great and seem to be quality made. The only issue I had is that one of the socket screws was inserted the wrong way so the allen key wouldn't work. I had to take time to unscrew it using pressure while turning but it eventually came out. Once I flipped the screw over I could use the allen key and all was well. I'm guessing they use a machine or magnetic tool to insert the screws because there is no way an allen key could put in backwards like it was.

I built my own timing belt kit for Ender 3 V2 with Creality dual-z kit. These fit and work well for that application.