Bi directional Sanding Block for Leveling Frets - Bi directional sanding block designed for leveling frets and smoothing fretboards with two radii options per block for versatile use on guitar and bass projects - Innovative design: each block can match two radii, making it suitable for bass building and repairing - Radius options available: 12#&16#, 10#&14#, and 5#&20# - High quality material delivers excellent shine and long lasting durability - Comfortable handle with a side slot design for optimal control and performance Key benefits and how it helps you - Aligns with common fretboard radii to produce even fret heights and a smooth surface, reducing uneven leveling - Dual radii per block gives flexibility to work on different instruments without swapping tools - Durable construction and polished finish stand up to repeated use in workshop settings - Side slot and ergonomic handle improve grip and precision during polishing and leveling tasks Practical use scenarios - Fret leveling on a bass or guitar: select the radius pair that matches your instrument to achieve consistent fret height across the board - Bass building and repair: use the dual radii to accommodate typical bass fretboard curvature during setup or repairs - Routine fretboard maintenance: quick touch ups during builds or field repairs to maintain smooth, even fret surfaces