Knife holder swivelling adjustable from 0 - 65°. Quick and easy angle adjustment of common angles (15°, 30°, 45°, 60°) by additional locking positions in 15° steps. Workpiece edges tear-free on both sides due to alternatinv shear angles. Economical due to partial change of diamond cutting edges. Noice reduced design with optimized gullet design for improved chip removal.