Our hub end play gauges are the quickest way to accurately set-up bearing pre-load spacers. This tool screws onto your spindle and reads hub end play to .0005". Once an end play measurement is obtained, simply adjust the spacer to the desired end play or pre-load and set the spacer lock. This tool will also measure hub run-out. Arm, indicator, and shaft are universal, simply swap spindle adapter for different applications.