5/16" inner diameter = 0.313 inch 5/16" inner diameter = 0.313 inch 10 Bearing R1810ZZ 5/16"x1/2"x5/32" Shielded Code: R1810ZZ Price: $19.95 Quantity in Basket: none R1810ZZ Bearing 5/16"x1/2"x5/32" Shielded Code: R1810ZZ-1 Price: $3.95 Quantity in Basket: none 10 Bearing 1603-2RS 5/16"x7/8"x11/32" Sealed Code: Kit209 Price: $19.95 Quantity in Basket: none 10 Bearing R1810ZZ 5/16"x1/2"x5/32" Shielded Code: Kit227 Price: $19.95 Quantity in Basket: none 10 Bearing R1810ZZ 5/16"x1/2"x5/32" Shielded Code: kit795 Price: $19.95 Quantity in Basket: none 10 Flanged Bearing FR1810ZZ 5/16"x1/2"x5/32" Shielded Code: Kit2043 Price: $39.95 Quantity in Basket: none R1810ZZ/W7.905 Bearing 5/16"x1/2"x5/16" Shielded Code: Kit7131 Price: $9.95 Quantity in Basket: none SR1810ZZ Bearing 5/16"x1/2"x5/32" Stainless:Shielded Code: Kit7292 Price: $5.95 Quantity in Basket: none 1605ZZ Bearing 5/16"x29/32"x5/16" Shielded Code: Kit7518 Price: $9.95 Quantity in Basket: none 1605-2RS Bearing 5/16"x29/32"x 5/16" Sealed Code: Kit7623 Price: $9.95 Quantity in Basket: none R1810 Full Ceramic Bearing 5/16"x1/2"x5/32" Code: kit7840 Price: $59.95 Quantity in Basket: none 10 Bearing 1603ZZ 5/16"x7/8"x11/32" Shielded Code: Kit7881 Price: $19.95 Quantity in Basket: none