ELECTRIC

They are intended for drilling holes in coal and rock of similar hardness, and in the ER-6 version... in soft and medium-hard rock with rotary drills consisting of a rib or diamond rod and a handle (maximum hole diameter Ø43).

It is designed for drilling holes in coal and rock of similar hardness using rotary drills consisting of a diamond-shaped screw rod (Ø37) or a spirally ribbed rod (Ø39) and a handle (maximum diameter Ø43).