This 7001CE/HCPA9ADGA bearing is a Super Precision angular contact bearing with a 15° contact angle and the balls are hybrid ceramic, also known as bearing grade Silicon Nitride. This is a universal fit double set of bearings with a light preload and a PA9A precision rating. The bearing's dimensions are 12x28x8mm. Often used in Machine Tools, or other precision applications, these bearings are known for their high-speed capabilities, robust seals, and superior accuracy.