500mm MGN15 linear rail guide with 1 MGN15H carriage block, with 13 holes on the rail for M3 screws, the first and last one are 10mm from the ends of the rail
There are 2 red rubber stoppers or cable ties to keep the block on the rail
Please be careful when removing the block from the rail or installing the block to the rail, in case the balls in the block fall out.
Used for high load conditions
Comes with 2 spare balls for backup