What is the difference between "M1" and "M2" on the SB1600?

The tab points towards the door on one, away from the door on the other.  

M1 has the bend pointing away from the door, can hook it with a foot if on the bottom.  

M2, the bend points towards the face of the door.  A more deliberate push is required  to pull it up or push down.  


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