Ball Bearings 6008 ZZ 40 x 68 x 15 6008ZZ Bearings, 6008ZZ inner diameter is 40mm, 6008ZZ outer diameter is 68mm, the 6008ZZ width is 15mm, 6008ZZ is a popular size that could be used in many applications, 6008ZZ Bearings are made of Chrome Steel,6008ZZ can rotate up to 15000 rpm, 6008ZZ bearing has Double Shielded to protect the bearing from dust or any possible contamination.