I am assuming you wanted M10. 10.5mm drll hole and tap tool
https://www.mcmaster.com/#91709a548/=19kd3lj
This is 1L
https://www.mcmaster.com/#91732a648/=19kd2wt
1.5L
https://www.mcmaster.com/#91732a265/=19kd31a
IDK how much material you have depth wise
*Since you have a blind hole, be damn careful to not bottom out the tap. They will snap and then you will be all sorts of ****ed*