Product Review

Internal Diameter is 6.00mm.
These bearings can also be used with 5/16" (7.94mm) stainless steel shafts.
Overall Dimensions: 18.00mm x 11.00mm x 11.00mm.
Pre-lubricated and sealed.
Package include:6 Pcs.
Brand Listing, If you buy is not OctagonStar brand product, You Can Apply for a Refund and Compensation.