FARO 3-1/2″ Mounting Ring For Portable CMMsCondition:* Used, Removed From Service In Working Condition. As Pictured.Additional Notes:* Mounting Ring Diameter: 3-1/2″, Is Typically Used For All FaroArm Models.* The Ring Has Six Holes, Allowing It To Be Mounted To Any Flat Surface.* The Outside Of The Ring Is Threaded To Accept The Locking Collar Of The FaroArm. FARORP20826