Precision Brand 76380  Brass Thickness Feeler Gage, 0.010" Thickness, 1/2" Width, 5" Length (Pack of 10) Made from 1/2" wide, 260 brass alloy Used in manufacturing and maintenance of highly technical markets where a nonmagnetic, noncorrosive product is needed to check extremely close spacing Measures 1/2" wide by 5" long by 0.010" Thickness is clearly marked every 6" in metric and decimal