Designed especially for widening and final fitting after using our 65Adeg Sight Base Cutter to cut the basic slot. Or, can open up a 60Adeg slot to proper 65Adeg angle if changing to a new sight design. Has true parallel cutting edges for precision filing, giving you full control over the angle of the dovetail. One cutting side only, with the other two sides safe, so you can widen or deepen sight slots safely without fear of changing the other dimensions. Mfg: Brownells SPECS: 7" (17.8cm) long. .280" (7.1mm) wide. #1, medium, double-cut. #2, fine, single-cut.