Add Wish List Choose Options UltraView Ultraview Funky Knob The UltraView’s Funky Helix Knob is compatible with all thumb button style releases such as TRU Ball Abyss GOAT, Carter releases, Scott, B3 and TruFire. The angle of the knurling is perpendicular to... MSRP: $9.99 Was: Now: $6.99 Choose Options