- Stainless steel ruler, 12-inch length x 1⅛-inch width
- Graduated in inches and millimeters
- 1/8", 1/16", 1/32", and 1/64" graduations markings
- Features a hole on one end for hanging
- The other side of the ruler features an inch to millimeter conversion table, tap drill reference table, and required hole diameters for English and American bolts ("W" designates a English Standard bolt, "U" designates an American Standard bolt).