Box contents - 1 x 4 inch long push gauge with maximum opening length. Materials and durability - Made of carbon steel with heat treatment for wear resistance, hardness and long life. What it does - A useful measuring tool for measuring the inner diameter or groove width of cylindrical holes and transferring this measurement to a ruler. Design and adjustment - Four legs made of high quality carbon steel with hardened tips for precise marking on workpieces. - Legs are easily adjusted by an adjustment screw to ensure accurate measurements and fine adjustments. Key benefits - Accurate inside diameter and groove width measurement for reliable setup and inspection. - Quick transfer of measurements to a ruler, reducing guesswork and errors. - Hardened tips enable precise marking on workpieces without slippage. - Durable carbon steel with heat treatment supports long-term use in demanding workshop conditions. - Four adjustable legs provide stable contact and precise alignment during measurement and marking. Applications and use scenarios - Machining setup: measure the inner diameter of a cylindrical bore and transfer the reading to a ruler for tool setup and verification. - Quality inspection: check groove width in cylindrical housings or shafts to confirm tolerances during maintenance or after machining. - Layout and marking: mark workpieces with precision before drilling or milling using the hardened tips for accurate layout lines.