Timken Bearings are the best aftermarket bearings on the market! I stopped buying cheap bearings at the chain auto parts stores. They sell bearings at 1/2 the cost but the usually fail within a year. So spend 30-50 more and maybe never replace them again. Wheel bearings are not very difficult to install. Plenty of videos on line that will show you how. You do not need air tools, it would be nice but I do not have any and I have done all my wheel bearings on three separate cars for the last 8 years...You can do it. You will save more than $300 per wheel doing it yourself. I just did all 4 on a 2008 Dodge Grand Caravan (Northern Car, Rusty mess) for less than $400 and replaced the bearings with all Timken bearings. I was quoted $1800 to do the whole job. Saved myself 1200. Now that's a vacation for sure!!!!