Whitworth and Metric Combined Screw Pitch Gauges - 49 Blades MW800 Series - MEB-804 49 Accurately milled steel blades Designed to check both internal and external thread forms Metric Threads - 0.4,0.5,0.7,0.75,0.8,0.9,1.0,1.25,1.50,1.75,2.0,2.5,3.0,4.0,4.5,5.0,5.5,6.0,6.5,7.0 Imperial Threads - 4,4.5,5,6,7,8,9,10,11,12,13,14,16,18,19,20,22,24,25,26,28,30,32,36,40,48,60 Marked with nominal size on each blade