We, Royal Micro Irrigation Systems Are Authorised Dealers And Service Providers Of Garden Machinery. One man, one field and one big mission to be completed alone – to bore holes up to 20 cm in diameter into the earth or take soil samples. This is possible with the STIHL BT 121 one-man earth auger. It is the only earth auger in the world to feature a QuickStop drill brake including a release lever. If the drill jams in the ground, the release lever turns towards the operator's thigh. The power flow from the engine unit to the drill is interrupted and the earth auger stops immediately.