For everything from checking plane soles and whet stones for flatness to precise power tool setups, a benchmark for straightness is an essential shop standard. This 24" model is made of solid polished steel and machined flat to within 0.0011" and parallel to within 0.002". It comes with an official calibration certificate ensuring accuracy. Weighing in at almost 3 pounds, it stays put where you want it, freeing up both hands to make adjustments. Importantly, the finger grips provide a non-slip grip, ensuring that you won’t drop the straight edge and potentially throw it out of calibration. The hang-hole allows safe, convenient storage.