I am a fire fighter I would like to know if I get stuck in the wrong place and have to come down over the side of a building in a hurry how well will this iteam work for me

I totally agree with the previous answer and I will add this: Most of the products sold here are designed for sport climbing. The manufacture assumes that you as the owner know the history of the hardware and how you have used it so you can make a educated decision on when to retire it. This allows the use of much lighter weight materials to be used that won't last as long. Hardware that is intended for commercial use is generally the same design but much more robust and longer lasting but weigh a lot more. Using a sport climbing device not rated for commercial use may also be against local safety laws.Regardless of the device you use PRACTICE PRACTICE PRACTICE! Rappel with gloves and without. (who knows you might loose a glove or something) Practice rappelling long distances with the diameter of rope you plan on using. (longer rappels are tricky as you start going very slow but start building up speed quickly) If you read the book Accidents in North American Mountaineering you will find too many deaths due to simple mistakes rappelling. Battling a fire is not the time to be unfamiliar with your rappel device. Be safe out there.