Check the listing for details. CNC DIAL TEST INDICATOR MOUNT (Holder) & Arm for CNC Routers and Mills (65mm). Condition: New. Listed at 59.99 USD. Description:This CNC/mill accessory fits any 65mm sized router or spindle, including the widely used MAKITA RT0700C/RTO7O1C Trim Routers (65mm). The arm reaches out up to 11” from the spindle center. If you have a 69mm router or spindle, we have a version of this product for you at: https://www.ebay.com/itm/186655469785 Get your vise, bed, or workpiece set EXACTLY parallel or square to your CNC’s directions of travel. The CNC Indicator Mount & Arm holds an accurate .01mm dial test indicator to your CNC’s spindle or router body. Now when you move the spindle, you’ll be able to see if it’s exactly in line with your workpiece, bed, or vise. Comes WITH .01mm accuracy dial test indicator. Specifications:- INDICATOR ACCURACY: 0.01mm, equal to 10 microns or about 0.0004"- REACH: Up to 11” (280mm) from the spindle’s center- COMPATIBLE WITH: any 65mm sized router or spindle, including the widely used MAKITA RT0700C/RTO7O1C Trim Routers (65mm) Note: It is not recommended to use this tool with the spindle running. At high temperatures (>140°F or >60° C) the 3D printed body could begin to experience some deformation.