I purchased a few of these before christmas, I was highly impressed with the quality for the price so I bought a few more.
This website is straight from china so shipping is slow. I have bought many things from them over the years. I also like there round sander mandrels and paper, paper doesn't last very long but it is super cheap.
https://www.banggood.com/Drillpro-Wo...r_warehouse=CN
https://www.banggood.com/100pcs-4-In...r_warehouse=CN
They have other sizes also