EGW-SA/EGW-CA Low Profile Linear Bearing Flange Type https://www.hyballscrew.com/product/linear-guide-rail/egwsa-egwca-low-profile-flange-type-top-lock-linear-guide.html The lubrication structure of the linear guide is simple. If the sliding guide is insufficiently lubricated, it will cause the metal on the contact surface to directly friction and wear the bed. However, it is not easy to lubricate the sliding guide sufficiently. It is necessary to drill holes in the appropriate position of the bed to supply oil. The linear guide rail is equipped with a grease nipple on the slider, which can be injected with grease directly with a grease gun, or can be replaced with a special oil pipe joint to connect the oil supply pipe to lubricate with an automatic oil supply machine.