***Size:Inner diameter varying from 1mm to 17mm. ***Material:stainless steel.Chrome steel.carbon steel. ***Category:Mini ball bearings.Deep groved bearings,Extra-thin bearings.bearings with flange and in stainless stel.non-standard bearings.bearings with Teflon and Nylon seals and bearing with ceramic balls. ***Function:Widely uesed in fishing reels,Hobby models,Romote radio control products ,Power transmission,Medical instruments and office appliances. ***Integrated Grade: ABEC-1;ABEC-3;ABEC-5