About this item Thickness: 1.5-2mm Made of high quality steel Size: 4 mm, 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 22 mm, 23 mm, 24 mm It’s can be used for adjusting bolts It’s thin enough for you to reach anywhere you want