Lenght: 220mm 

Diametr: 60mm, 70mm, 80mm, 90mm (Screw 70 mm can chop wood to 80 cm in diameter is sufficient for 98% of cases) 

Material: High qulit steel (40; 45) 

 Hardness: (163-192; 192-228)

 Thread: Hard left 

Thread pitch: 6mm 

 Thread depth: 3mm 

Hole diameter: 28 mm (but we can do it on your demand)