I bought this to do TNR with feral cats. I was using a carrier baited at the back door and had to sit there for hours and days waiting for the cats to walk in so I could quickly shut the door. This trap is much easier. And, there are NO springs on the door so no injuries But I will list some TIPS for using it. I always cover the trap with an old towel. Cats are curious by nature and tend to check out darker spots. Place a heavy object on top. I use ONE cinder block. This is so a very upset critter can't tip the trap over, which then releases the door. Have some type of easy hook to quickly lock the door shut before picking up the trap. I caught a feral within just a few minutes of first use, but when I reached to pick up the trap she hit the door so hard that rings went up and she was gone. I was left standing there in shock. 2 of my previously spayed ferals also went into the trap and I had no problem releasing them. I have just purchased a trap fork on ebay also. Will prevent release while locking the door. I'm so glad to find a trap that has no springs and is so easy set up.
Made of very heavy steel, with a dead fall locking system, animal will have to be dispatched before release. Nice and heavy, smaller type handle may need replaced. Painted dark green, a wire mesh trip pan, with very heavy rods doing the release.