Wheel Marking Gauge This tool allows you to make perfect hairline layout marks both with and across wood grain. The single bevel edge wheel scribes a fine line without tearing the wood fibers and does not wander with the wood"s grain. Features: Precision machined solid-brass body and knurled lock nut. Brass head with 8" steel rod Shaft is graduated 1 mm / 1/32 inch increments for easy reference Can be used as a depth gauge Great for quick measurement transfers Wheel retracts into face of the gauge for protection and easy vertical storage Free-spinning wheel cuts wood fibers; doesn"t tear them Designed for comfortable one-handed operation Balanced feel