Threaded holes of the block: 4-M3*3.5; center distance of the holes: 20*20mm
There are 2 red rubber stoppers to keep the block on the rail
1. 350mm MGN12 linear rail guide with MGN12H block
2. 350mm MGN12 linear rail guide paired with MGN12H block
3. 350mm MGN12 linear rail guide and MGN12H block included
4. MGN12H block with 350mm MGN12 linear rail guide
Come with 2 spare balls in the package for backup
There are 14 holes on the rail for fixing the rail to the machine with M3 nut and screw, and it is suggested to use T nut M3 if you fix it to 20 series EU Al-profile