[Closed] Flight case internal dimensions

Anyone any experience of flight case sizing? This says internal dimensions 170 x ... would that 170mm be the extreme dimension between hard surfaces inside? I think it will be, but am doubting myself. It's for housing my telescope and its max diameter is 145mm so think it'll be fine. Anyone any reassurances to offer?? Thanks 😊 edit: found it cheaper on eBay but this link is simpler...

https://www.maplin.co.uk/roc-cases-aluminium-flight-case-with-foam-block-included-silver-5055396106299