300mm 8mm T8 Lead Screw Set with Lead Screw, Copper Nut, Hexagon Wrench, Coupler, Pillow Bearing Block for 3D Printer

Well this item came well packaged and fast. "Pillow bearings" are actually 608 bearings just pressed into a cast aluminium housings that are the same shape as a pillow bearing. They work, if it's mounted perfectly on 2 flat surfaces. The rod was 304mm long. Would that kill your project maybe for me was not an issue. One end had burs in the teeth where it was cut and ground. The nut was good and the rod was pretty tight to it. They gave a decent coupler for the motor to the shaft. They had 4 2mm hex socket set screws in the unit. They where even so kind as to supply a 1.5mm Allen key for them lol.... notice an error there?Was it worth What I paid? Yes. Think about it the shaft alone with a nut is the same price. So yeah I think even if the stuff included was made by a guy in a cave in a sweat shop some place it was still worth the price.its all functional.

Should not be in a search result for Ender 3, about 50mm too short

300mm 8mm T8 Lead Screw Set with Lead Screw, Copper Nut, Hexagon

If you want precise mounting, you will have to work for it or use other brackets.