General Purpose Grade 1000 Hardened Carbon Steel Ball Bearings: High Quality Graded Hardened Carbon Steel Ball bearings made from Carbon AISI 1010 steel. Hardened to 60-67 Rockwell Scale equivalent to 700-900 HV (Vickers Scale) and are hardened all the way through the ball. These are the same hardened steel balls used to manufacture bearing assemblies and have a high duty and life cycle.
I was really impressed with the selection of balls you offer. Your website was very user friendly and I found what I needed in no time. The free delivery option was a bonus and my bushes arrived next day. Keep up the good work.