Product details:

Easy to set up gages into required position. Holds 3/8 and dovetail. Bottom Arm Length: 4.45 Top Arm Length 6.4 Powerful 176 lbs. on/off magnetic base. 3 dimensional dial gauge holder has Noga's unique central locking mechanism with spring loaded bearing for easy set-up. It is an auxiliary tool for any general measurement and helps to increase precision and working efficiency. Avoid work stoppage by increasing precision and measuring efficiency with these handy indicator holders. Their strong magnetic bases and superior holding power clings firmly to any ferrous metal component, supporting the gage for more accurate measurements. Capable of 360° rotation for maximum versatility, the articulated arm reaches every possible position, even upside down. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.