The Bussmann series NO. 44 assortment pack contains a variety of ATC fuses as well as the FT-3 fuse test/puller. ATC blade fuses are used to protect an onboard electrical system. All of our fuses are color coded and have the amp rating stamped on the front to make them easy to identify. The transparent housing also lets you see when the fuse is blown, allowing you to quickly identify which fuse needs to be replaced. It also includes an FT-3 diagnostic fuse tester/puller. The FT-3 combination fuse tester/puller checks the fuses in your onboard system to help you know which fuse has blown. It’s a great option for testing both glass and blade fuses. It’s simple to use too: If the light glows, the fuse is good.