Founction : Reduce buffer when the auger bit met stone and other stronger object Size : φ20 mm to φ20 mm ( Bisc) Package way : Small color box package at first , then 20 pcs in one carton
1. Extension rod for extend the auger bit , make deeper pit 2. Hexagon bolt / Spring D type Nut 3. Dia 38 / 25 mm 4. Length 45 / 50 / 60 / 70 / 80 / 90 /100 .... cm