When it comes to Jointer setups, layout, drafting, lapping the sole of a hand plane, or checking lumber for warp, a precision straight edge is an essential tool for the shop. These premium straight edges are meticulously ground and lapped for straightness and Parallelism, and they feature a beveled edge with a precision 1/64 inch scale, which means they double as precision rulers. Available in 12", 24 inch and 36 inch lengths, they feature a hanging hole, and include a protective case If you prefer to store them in a drawer. Technical details: igaging precision straight edges are made of hardened steel. Accuracy: 0.001".thickness: 3/16". width: 1-9/16". satin chrome finish. All edges have true right angles. Bevel edge has 1/64 inch precision scale in us standard.