Features These thread pitch gauges measure different screw pitch types in both standard and metric units. A screw or threaded part or fastener is checked against the leaves of the gauge until a leaf that matches the screw pitch is found. These gauges are used for woodworking and general light and heavy machining applications. Included Threads per Inch / 4 to 42 TPI Maximum Thread Pitch - mm / 42 Minimum Thread Pitch - mm / 4 Number of Leaves / 30 Thread Angle / 60 Degrees Thread Type / Metric Gauge Material / Steel Locking Device / Yes