Premium 15:1 gear ratio vintage on a plate guitar tuners; Available with two different mini oval buttons (metal or plastic) for vintage-accurate authentic lookingComes with 1/4"(6.3mm) string posts; Fits 11/32"(8.5mm) vintage tuning peg holes, DO NOT fit modern 25/64"(10mm) tuner holes. You will need to order the proper 10mm adapter bushings with 1/4" I.D. dimensions separately for installing these tuners on modern 10mm tuner holes heardstockSmooth and accurate tuning; For most vintage Gibson style Les Pal/SG/Junior/ES guitars, may require modifications for Epiphone/Import guitarsMade from high quality materials, improve tuning stability and professional grade performance. For each tuner, there is a washer under the string post for extra firmness, to avoid wobbly post for better sustain and more stable tuningPerfect replacement for the worn out tuners, great for upgrading your guitar or a new project