Advantages: Each product is equipped with five cutter heads of 5.5cm length, which are 6mm, 3.5mm, PH2, PH1 and ph1 . The customer can easily disassemble the bit by simply shrinking the auger and pressing the metal cap on the head. There is a ratchet switch in the middle to adjust up and down. the screwdriver to tighten or unscrew the screw, greatly improving work efficiency, Manufacturer: Fuhjythy