Like it says on the tin, these are small cooling fans originally intended for cooling the radiator on ATVs and motorcycles. The manufacturer's product page is here: Spal 30103009

I am selling them on ebay - if you prefer that route - for $30 each plus shipping, but if you are a DIY member and want to buy them directly from me I will sell them for $25 each, or a box of (10) for $200 (plus shipping).