P2P constraint limits the translation so that the local pivot point of 2 rigid bodies match in worldspace. This can be useful to make chain.

Icon Size:
Defines size of the icon in the viewport.

Master Object:
Master object is base object of constraint. You can pick Dynamic / Static / Kinetic object for this. If you don’t use this option, objects constraint to this icon position.

Disable Collision:
When checked, disable collision between master object and constraint object.

Constraint Object:
You have to pick Dynamic Object for this.

Select single object to add from viewport.

Select multiple objects to add from scene explorer.

Remove selected objects from the list.

When checked, constraint breaks when objects get some impulse.

Defines breakable impulse threshold. If object get impulse larger than this, constraint breaks.