PRICES MAY VARY. High grade hole saw 9 inch with 3/8'' Hex shank Mandrel,the cutting depth is about 1.24 inch (32mm),it can make 9 inch diamteter holes. Heavy duty for making Cornhole Boards,air ducts,ceiling light,speakers,duct work,it can drill in drywall,wood ,plastic, gypsum board,aluminium,soft thin metal and rubber. very useful for Interior decoration, DIY tools, downlight installation. Good material:High Speed Steel M42 Bi-metal. with sharp teeth,cut the wood very easy and non binding cle