STRAIGHT EDGE Hang hole for suitable stowage. Includes reusable defensive edge. Manufactured with 1/4" thick cold rolled steel. Precision ground edge to +/- 0.10. The 611mm straight edge shows a precision ground edge designed for examining engine blocks and cylinder heads for deformation. Use with a Feeler Gauge to examine for deformation on Cylinder Heads, Main Bearing Saddles, Cam Covers and Bell Housings,Fly Wheels,Cam Bearing Saddles, Engine Blocks.