Dynabrade 52378 3" (76 mm) Dia. Straight-Line Type 1 Extension Wheel Grinder, 1 HP, 18,000 RPM, 3/8"-24 Spindle 
Insize 6144, ACCESSORY SET FOR DIGITAL CALIPERS, 6928640380839
$83.88
Suitable for 0-6″/0-150mm and 0-8″/0-200mm electronic calipers (thickness of lower jaws? .146″)
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