Roll-links are a Rutgerson innovation and has been proven to be superior to ball bearings. The reason is that the load is spread over a larger area, which results in a reduction of the strain on the material.
The design of the roll-links with a stainless steel link that holds the rolls apart prevents obstruction or clogging with salt or dirt and requires no maintenance other than occasionally rinsing with fresh water.
T310504 (24 rolls) fits T610192