This is a 500mm long MGN15 linear rail guide (linear slide or linear guide) with 1 MGN15H carriage block, with 10 holes in the rail for M3 screws, the first and last are 20mm from the ends of the rail. There are 2 black rubber stoppers or clips to hold the block to the rail.
Be careful when removing the block from the rail or installing the block on the rail, in case the balls in the block fall out.
This guide is widely used for high load conditions.
