The easy way to square your mill. Just zero the indicators on your surface plate, install the spindle square in your milling machine spindle, bring the spindle down to the table and adjust the head until both indicators read the same. It's that easy! Once you use it, you'll never want to square the head of your machine without it.

Features:

• 1/2-inch shank, fully assembled and ready to use with indicators pre-mounted in the unit
• No more tramming or split readings, compensating for loose, worn gears or mirrors
• Can be used with a sine bar or protractor to set angles
• Constructed of steel with ground contact points and manufactured in the USA
• Custom wood case included
• Patented design