・This is a rare 1.6mm thick bearing. Recommended for those who find that the knob doesn't rotate smoothly or feels like it's rubbing with existing bearings or collars. ・Compatible with 4mm handle shafts of Daiwa and Shimano. Perfect for those who are missing bearings when replacing knobs, want to add more bearings, or found the thickness to be incorrect. ・We can accommodate adding more bearings, so please inquire through the question box. We will make it a dedicated listing.