This is a 50" saw mill blade with 2" arbor hole. This is a replaceable tooth blade, it is missing a few teeth but I believe the holders are there. This was take from a mill that was scrapped a couple of years ago. The blade is in usable condition or can be used for decoration. It has a great light rust patina. There are blades on ebay for $800 and they cost about $2500 new.