Accurate holes for a better fit! Our special wooden-handled steel reamers properly taper the holes for bridge pins. These reamers are semi-fluted, to help keep the holes round. This money-saving set includes reamers in 2 sizes to cover a wide variety of bridge pin hole sizes! The 3-degree reamer tapers from approximately .312" to .150", with 3" cutting length, and is suitable for many bridge pins from Gibson and Gurian. The 5-degree reamer tapers from approximately .312" to .135", with 2" cutting length. It works for vintage-style pins, as well as modern Martin bridge pins.