Spinner Snap Toggle 
Main toolbar > Spinner Snap Toggle
Spinner Snap Toggle sets the single-click increment or the decrement value for all of the spinners in 3ds Max.
To set and toggle spinner snap:
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Do one of the following:
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Choose Customize menu > Preferences.
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Right-click the Spinner Snap Toggle button on the main toolbar.
Either method opens the Preference Settings dialog > General panel. The two controls for spinner snap are in the Spinners
group on this panel.
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Set a value in the Snap field.
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Turn on Use Snap.
When you exit the dialog, the Spinner Snap Toggle button is turned on.
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As you work, use the Spinner Snap Toggle button to toggle the alternate setting.
The amounts for Spinner Snap are controlled by settings on the General panel of the Preferences dialog. Default=1.0.