"Used these bits for many years for drilling through floor joists with no problems I use a 18v impact driver which will drive the 25mm bit through easily .I always use an impact drill with any wood bit, because of the way the impact driver works they can be used one handed - I never use an ordinary drill I have too many twisting on me even with the clutch - a plumber I know broke his wrist drilling a floorboard so be warned."
"Great kit as they've all said, and cuts a tidy hole relatively easy through joists. The lead-screw end pulls it through. However the last few millimeters need a bit more force which causes a rough exit. This is because the screw is no longer pulling it through, and theres a large area of cutting edge. No problem unless you're really short of space to push it through. The main issue to watch is that the 25mm bit needs about 25Nm torque. My Ryobi which is purpose made for the tight spaces cannot acheive enough torque for this bit, even though it easily drives a normal 25mm lead-screw bit through."
"Did quite a bit of research first before going for this set. Needed to run Hep2O piping for CH in the extension and these made the job real easy. Super sharp and took no effort to go through the joists and with the joists on 400 centres I was able to use my Dewalt drill / driver with these and still have a bot of room to make sure the holes were square / level. A brilliant bit of kit and although I have spade bits would have taken longer and wouldn't have been as neat."
"bought the 3 piece box set for drilling through joists to cable plastic pipes through on a underfloor heating job. used a cordless impact drill driver on impact mode and it just eats it up all day long the bit pulls itself through very fast clean hole very impressed will buy more"
"I bought these to drill holes through joists for pipes and cables. When fitted into a cordless drill, I could drill straight through between the joists without having to start on an angle. This made feeding pipes/cables much easier. The drill pulled itself through easily and cleared the chippings well. Time will tell how long they keep their sharp edge."