ITEM NAME:58pcs/set Screw Gauge Whitworth 55 Degree Metrisch 60 Degree Thread Pitch Ga Cy.It is 55 Degree & 60 Degree Thread / Screw Pitch Gauge gage with lock up device. - Check the angle on the thread cutting tool on the V groove of the gauge. Type: Thread gauge. 1 x Screw Gauge Set.