There are different cross-bars in the locks. Big and small cross-bars. The bigger ones. Single... Double... Triple... Different as cross-bars are, indeed they are only two types:
GOOD CROOS-BARS...... and VERY GOOD ONESA "good" croos-bar is that you liked when you has come to buy a next new lock in the shop.
A "very GOOD" one is that is able to keep from making efforts to open a door from any directions (to and fro) and also that is the more durable one than it is provided in accordance with DIN and declared in the lock manual.
And also there is another difference. The first type of a cross-bar is invented for common market. And the second one is done for yourself. Because in "DORI" a cross-bar is made as if it has been done for yourself, so it has been patented else.
