Review on 🔩 50 Count European Standard T-Nuts, M4 T-Slot Nut Hammer Head Fastener, Nickel Plated Carbon Steel for Aluminum Profile – 20 Series by Jared Peck

Order these because it says it's an M4 T-Nut to be used with my M4 replacement bolts for 3D printers, and as you can see from the pictures they do not match. For comparison, I have a 3D print with holes for an M4 bolt, and the holes in the M4 nuts I got are wider and fit loose. I took one of these nuts to my local hardware store and found them to be a perfect match for an M5 bolt. I didn't return them because I had to set up some 3D printed supports and couldn't start the return process and wait for new ones or refunds. I am not sure if they sent me the wrong size or if they are the wrong size. Otherwise the quality seems good and once installed with the right size screws they do the job of holding the supports in place. I had to modify by enlarging the holes on my printed supports to fit the new M5 bolt.