WCT Tube traps ?

Is anyone using WCT Tube traps for Norway rats, what are the baits you are using successfully, I have been using the Koro trap and they work great but I need one that I can hide more easily. the largest longest N. Rat was just over 18 inches and they are smart and tough.

Should work, but that bar firing would break a hand easily. Be real sure kids, pets, etc won't be around the trap.