Do you mean a 'NASH' trap ?
Not a common tool, but I have some and use some.
I catch moles in them.
You have to pre-cut the groove where the loops are placed, otherwise the trap will fire too slow !
As far as the OOS trap, I make the best tool for setting OOS traps, bar none.
I've made experts out of people that had never set a mole trap.
Anyone that has ever used one will tell you that !
The guy who made the original, (who wasn't a mole trapper) tried to sell the design to the Woodstream Corp. , who makes OOS traps
If any of you are on face book, you can check out Angela Hawkins' page and see her catches of 50-60 plus moles per check using the tool.
Another trapper who had never caught a mole, but is considered the best in her area by many lawn specialty companies !
LTG