Diamond hole saw bit recommendation

[Lgara1303]

Hey guys, I need to drill a 32 mm hole or one and 1/4 inch return hole for my bulkhead. I’m just wondering if anyone recommends a diamond coated bit for this or not and I preferably need it by Saturday so something on Amazon or something I can get off of eBay would be great, there is quite a few out there so I’m not sure if there are some people that are better than others

 

[Jason_MrFrags]

Ebay or Amazon is a good choice for a bit you will probably just use one time. Just make sure that the panel you are trying to drill isn't tempered. Watch some videos.

 

[Lgara1303]

Ebay or Amazon is a good choice for a bit you will probably just use one time. Just make sure that the panel you are trying to drill isn't tempered. Watch some videos.

Okay can you offer your opinion on these which would you go with the ones that are just metal or the ones that are like coated

with paint just not sure which one would be better