This is an MGN15 linear rail guide (linear slide) 600mm long, with 1 MGN15C carriage block, with 10 holes on the rail for M3 screws, the first and last being 20mm from the ends of the rail. There are 2 black rubber stoppers or flanges 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.
