This is our Fusion, LONG, Narrow Width, Fine equaling file –, this is Bob’s favorite 1911 Benches File. Used for working the inside edges of the frame; it is long and ridged enough to get deep into Mag-well area & trigger track, Also great for other internal flat areas of the 1911 frame. In-addition, it is a great file to burr the edges of the slide rails. Bob also used this file for Thumb safety and Grip safety fitting. This is a very high quality file that will last for years with proper care. Size: .120" thick, x .25” Width x 10.5” overall length with tapered tip to get into the hard to reach places in the slide rails.