Wrong bore diameter and made in Taiwan The first set of these bearings was installed on my bedroom window air conditioner fan motor. They went straight in and worked like a dream. While servicing my window unit in the dining room, I spotted a whistling bearing. When I disassembled the fan motor I found that it required the same bearings. No problem, I "reordered" and they arrived quickly, but upon examining them I found they were stamped 608Z and not ZZ as advertised; NTN; Taiwan! Long story short, they weren't 8mm in diameter and I destroyed both bearings and nearly damaged my anchor. Domestic Racing says 608ZZ 938PX2. If you get one of these, send it back - it's junk. I couldn't imagine spending $8 on a piece of Taiwanese crap!