This is high quality bearing used in axial fans, motors, drive axles, clutch, idler wheels, HVAC, snow mobiles and many other industrial applications.
Bearings are made of Chrome Steel, pre-lubricated with grease and has rubber seals on both sides to protect the bearings from dust or any other types of possible contamination.
"d" (shaft or inner diameter) = 10mm (.3937")
"D" (outer diameter) = 30mm (1.1811")
"B" (width) = 9mm (.3543")
"r" (radius) = 1mm (.039")