Use the 12mm high-speed drill bit with stop in the angle grinder adapter, and the palm inoculation tool for fast log inoculations.
Use the 8.5mm high speed drill bit with stop in your drill or the angle grinder adapter for plug spawn holes.
Use the economical high speed twist drill bit for plug spawn. Sold with or without 5/16″ adjustable stop.
Use the adjustable stop to set the depth of your holes- saves much drilling!