FAG 7319 -B-XL-TVP-UA Angular Contact Ball Bearing - 95 mm ID, 200 mm OD, 45 mm Width, Normal NICE but they are essentially to

but they are essentially to provide a better protection and grip for your tools

The special open end geometry expands the placement possibilities of the tool which makes the ring spanner particularly suitable for narrow spaces

internal threads on the piston rod

creating a dual-sided recess

FAG 7319 -B-XL-TVP-UA Angular Contact Ball Bearing - 95 mm ID, 200 mm OD, 45 mm Width, Normal NICE but they are essentially toAngular Contact Ball Bearing and lightweight cage Angular Contact Ball Bearings have raceways in the inner and outer rings that are displaced relative to each other in the direction of the bearing axis. They are designed to accommodate combined loads. Manufactured to precision tolerance class for demanding applications. Features a lightweight polyamide cage for reduced noise and friction. Suitable for use in a wide range of industrial applications