I have a decent, but fairly standard, DeWalt drill. I was going to buy this attachment so that I can drill a hole in a metal shed (to install a fan): https://www.amazon.co.uk/Bi-Metal-Circular-cutting-Aluminium-Plywood/dp/B0C5S2SLNB/ref=sr_1_1?crid=33ZWDR8LTKVEX&dib=eyJ2IjoiMSJ9.ARPeSrNGQMPRNfjzQ9nT8LphOneBxp2bq77vCw3dNc09_eghTYXsvasiAUgoqvNZIFu6aPsLXKQQ1YeOPkiAFgNe3dYxf3f0-Nlf3FL7pXrjp3ElUq7r0i18Y6Cv-O6IBGyYsyqILTHtRZ8C2H4wTDvop6UaSS9o6pk0XcKDbiuXyBLFFjsDmbMt7IHB7xKmbgz5r1WS1uh902DLQGyFKtHAOwoGlU2tBaBHlxfIWQfZI6BicmWDDXsLcSKDS8WY9_fD3tHAQMYy3JjmNH2nNzAD8RbRTiaoj1tFVE29kaE.bDwPej6-V36XehdviYliDWy8assgN-rpKps7FC_sPjU&dib_tag=se&keywords=hole%2Bsaw%2B105mm&qid=1709312139&sprefix=hole%2Bsaw%2B105mm%2Caps%2C90&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1
Will this go straight into my drill, or do I also need an arbor, which appears to be the case with competing products, such as this one from Screwfix: https://www.screwfix.com/p/erbauer-multi-material-holesaw-102mm/42986#product_additional_details_container
I'm totally clueless, this will be the biggest hole I have ever drilled. What does an arbor do?