Koyo CR-16 Track Roller, Standard Stud, Unsealed/Slotted, Inch, Steel, 1 Roller Diameter, 0.625 Roller Width, 1 Stud Length, 7/16 Thread Size, 1-21/32 Overall Length, 0.438 Stud Diameter Koyo CRSB-12 Track Roller, Standard Stud, Sealed/Hex Hole, Inch, Steel, 3/4 Roller Diameter, 0.500 Roller Width, 7/8 Stud Length, 3/8 Thread Size, 1-13/32 Overall Length, 0.375 Stud Diameter Koyo CRSBE-32 Track Roller, Eccentric Stud, Sealed, Inch, Steel, 2 Roller Diameter, 1-1/4 Roller Width, 2 Stud Length, 7/8 Thread Size, 3-9/32 Overall Length, 7/8 Stud Diameter Koyo NA49/32 Needle Roller Bearing, Removable Inner Ring, Open, Normal Clearance, Oil Hole, Steel Cage, Metric, 32mm ID, 52mm OD, 20mm Width, 11000rpm Maximum Rotational Speed