## M5 5mm = 0.1969" ## M6 6mm = 0.2362" ==6.2mm ID x 13mm L [McMaster-Carr #96977A247](https://www.mcmaster.com/96977A247/)== TBD what size drill bit makes sense for clean through hole. Comparing 6/6.4 M6 SHCS head size is 10mm OD. - 10.5mm diameter Drill Bit ## M8 8mm = 0.3149" ## 10mm