Steel 20 leaf metric screw pitch gage: 0.4 mm to 6mm Pitch Range, 60 degree thread angle The SPI screw thread pitch gage is ideal for checking thread angles: Narrow leaf design permits checking both internal and external threads, even in small holes not accessible with wide leaf gages Locking clamp keeps the leaves in place during use or in storage Manufactured in Japan from high quality steel Thread pitch size is stamped on each leaf SPI 14-029-3 20 Leaf, 0.4 to 6mm Pitch Range, Steel Screw Pitch Gage 60 degree Thread Angle. The SPI screw thread pitch gage is ideal for checking thread angles. Locking clamp keeps the leaves in place during use or in storage. Manufactured in Japan from high quality steel. Narrow leaf design permits checking both internal and external threads, even in small holes not accessible with wide leaf gages. Thread pitch size is stamped on each leaf Number of leaves: 20 Made in Japan