Question what heat sink will fit in this case?

[waholi]

https://www.newegg.com/black-cooler-master-masterbox-q300l-micro-atx/p/N82E16811119331

 

[rgd1101]

for what cpu?

 

[USAFRet]

Obviously, you look at the manufacturers specs:

Cooler Master MasterBox Q300L Mini Tower PC Case

The MasterBox Q300L is your straightforward option in the lineup of the brand new MasterBox Q-series from Cooler Master. A series that might be small in size but excels in functionality and modularity without compromising on the thermal performance.

www.coolermaster.com

Clearance - CPU Cooler 159mm/6.2"


So that would indicate any CPU cooler smaller than 159mm.
Of which there are dozens.

 

[jesse13williamson]

The case supports a 240mm radiator on the front and a 120mm radiator on the back, so you'd probably want to go for aio cooling as it appears that many air cooling heat sinks would obstruct the exhaust fan to some degree.

 

[waholi]

for what cpu?

i5 6600k