These 4 in line Hipshot HB6 1/2" Ultralite Bass Tuners are from their premium quality and hugely popular Ultralite range, designed to eliminate neck dive in unbalanced instruments and reduce the overall weight on your shoulders. Machined from solid aircraft grade aluminium to give a housing that is extremely light and highly durable. The open back design and small tuner footprint further reduces the weight and the 1:20 gear ratio tunes up quickly and accurately. The 1/2" diameter version fits basses with a headstock post hole size of 16 mm (11/16").