HFS (R) Screw thread pitch cutting gauge tool set 4pcs centre gage 55&60&deg; Inch & Metric 52 Blades In a Set, Includes Lock Screw pitch Gauge 55&60&#xFFFD;&#xFFFD; CENTER GAUGE WHIT WORTH 55&60&#xFFFD;&#xFFFD;inch reading 2 pcs CENTER GAUGE WHIT WORTH 60&#xFFFD;&#xFFFD;Metric reading 1 pc Angle accuracy: &#xFFFD;&#xFFFD;10min.