Editor Reviews:

Product Description:
Designed to help prevent children from opening bi-fold doors, and to minimize the risk of pinched fingers. Simply place at the top hinge, no tools needed. Slide lock sideways for access. Clear plastic to blend in. Adjustable to fit most doors. Works on doors 1 3/8" thick and smaller. Comes with spacers/shims for narrower doors. Handle extension for ease of use.

Rating : - Excellent product, but not exactly what I was looking for.
This product is very sturdy and works as described on most door. I have large (full sized door) bi-fold doors and the product barely fit on them, so it didn't work as well as I had hoped. However, it does keep my daughter from getting her fingers pinched, and that was my main concern. When she gets stronger, she can probably pull it free by forcing the door open since the fit isn't so good. It pops off with a good tug. On any regular sized bi-fold door, I would give this product 5 stars. It had sizing attachments for smaller sized doors and I am confident that given a better fit I would work even better. Still a great buy. I tried it on a smaller door and the slide lock worked wonderfully.