The DYNAMIXEL FR13-S106K set is a side frame set for the XW540 series, which is used to mount the servo motor on one side of the robot platform.
Here is an example of how to assemble the waterproof option frame for the XW540 series:

Note: This set cannot be assembled with DYNAMIXEL AX/RX/MX, XM/XH430 and XM/XH540 series.
Scope of delivery
- 1x FR13-S106K
- 6x flat head spanner screw FWB M2.5 x 17
- 8x wrench screw WB M2.5 x 5
- 16x wrench screw WB M2.5 x 4