Beiter Tuner for Centralizer - complete - BlueStandard Blue Tuner. All parts included. 1x blue tuner, 2x blue covers, 4x stoppers, 4x M4x14 screws. The Beiter Centralizer features four carbon rods held together to form a square by a number of tuners. These tuners are factory positioned to avoid resonance in the system but they can be moved to adapt to your tuning style and tuners can be added or removed from the rods. Tuners are made from high quality thermoplastics and elastomers.