Mounting holes require drilling and tapping of existing pilot holes
In order of tapping difficulty: 5mm drill bit (75% thread) / #4 wire gauge drill bit
(50% thread)
M6X1.00 bottom tap
Shapeways Stainless Steel Tapping Best Practices
https://www.shapeways.com/forum/t/stainless-steel-tapping-best-practices.15234/#post-72966