This is a two hole disc/bar. The holes are 4mm but can be drilled out to meet your needs. I used 4 perimeters but if you need a bigger hole you need to add more perimeters or print 100% infill. Max hole size is about .5". I had to do a little bit of sanding to get a good fit without any leaking. I also designed it .5mm thicker then OEM discs for any printing errors.