20L is a patent product, mainly grind three bevel bit (inside and outside cold drilling), can grind the bit's top angle (tip angle), back bevel angle (second back angle) and back, the back and center blade size adjustable, accurate positioning, easy drilling, easy chip removal.
Grinding range: 4-20 mm
Point Angle: 135°
Power: 220V 50/60Hz
Motor:  120W
Speed: 4400 RPM
Grinding wheel: CBN (for HSS) or SD (for Tungsten Steel)
Standard equipement: 20L#seventeen collets, Standard grinding range: 20# (4-20)