for Hire in Blacktown and Sydney. The CONCRETE PLANER - 200MM WITH FLOATATION is one of the most innovative concrete planers on the market. The Mastiff® scarifier features the CutterSafe® technology keeping the production rate at its maximum without damaging the shafts at cutters. The fast raise and lower mechanism means you can stop scarifying & raise the drum off the concrete floor and then return to the same depth as before in a flash without adjusting the depth setting.