This gauge has 1/8 inch NPT male threads which pop out the back of the gauge. This gauge is a firstclass gauge made with a black metal case. 0-60 PSI air strain gauge with a 1 inch dial plate. This gauge has number markings at 0, 10, 20, 30, 40, 50, 60 psi. 1/8 inch Male npt threads, which measure about 3/8 inch exterior diameter. Colour:silver Material:steel Size:4 * 4 * three Package Contents: 1*Pressure Gauge Only the above kit content, various merchandise usually are not included. Note: Light and diversified exhibits can cause the color of the item within the picture somewhat diversified from the real thing. The length allowed error is +/- 1-3cm.