Minimum width 3.5cm, maximum width 8 cm clamp planner blades, chisels at 25 degree to 30 degree for sharpening on a flat diamond bench stone. Push and pull motion and the bronze roller glide smoothly on the stone sharpening consistently the bevelled angle.Best use with water on a diamond whetstone or on a dressed flat natural whetstone. Easy clamping of chisel and planner blade with the clamping knob.

