Опис з aliexpress:

3D Printer Upgrade Y Axis Hot Bed Support Plate for
150/235mm Aluminum Heatbed Hotbed Platform compatibility Linear Rail

1. It is 3D printer hot bed Y-axis upgrade kit, suitable for 235mm hot bed.
2. 235mm hotbed support can slide on 40mm wide V-slot profiles using POM wheels,and is also compatible with MGN12H Linear Rail.
3. High quality aluminum alloy material, surface coated with black treatment, Fine workmanship, wear-resistance and corrosion-resistance.