Starrett 270 7/16-Inch by 6-1/4-Inch Taper Gage Inch and Millimeter Graduation Taper gauge for measuring hole and slot sizes 0.001" graduations from .010 to .150" on one side and 0.05mm graduations from 0.3 to 4mm on the other side Steel body for durability and long life Measures 7/16 x 6-1/4 inches/11 x 160mm (W x L) Made from quality tool steel 7/16" wide by 6 1/4" long Accurately tapered throughout its entire length One side graduated from .010" to .150" Reverse side graduated ffrom0.3mm to 4 mm