This little holder has lots of holding power and It is only 4" overall length, 1" wide and 1" high to allow it to fit in tight of space. It features 6 mounting locations. There are 4 M5-.80 tapped holes with two screw to use, one 3/8" reamed hole for holding indicators with a 3/8" stem. And one 1/8" to 5/16" V-Shaped hole in the back for other mounts - usually included with a test indicator. Install a lug back on an indicator and you can hold it several ways using the M5-.80 screws included. There are many places where this fixture will work much better than the 20-000. Use with our dial indicator, 20-000, or the test indicator, 19-006. Or just use it to hold your plans on the machine so they don't get lost.