Description Cover your hex bolts to protect and hide them, fits most metric hex head bolts. NO SUPPORT NEEDED You might need to use a brim Measure the width of your bolts/nuts across the flats of the head: M6: 10 mm M8: 13 mm M10: 16 mm M12: 18 mm M14 : 21 mm Depending on the tolerances of your bolt, you may want to use the "tight fit" or the "loose fit". If your bolt/nut does not fit any of these sizes, use the “custom size” plate, and scale it in your slicer: Bolt Flat Width + Tolerances / 10 * 100 = Scale In Percent Feel free to leave feedback