The screed rollers are used for moving screed around any area comfortably whilst spreading. Also acts removing air bubbles and leaves a smooth level screed surface. These are the biggest sized plastic spikes at 21mm long. Comes along with the splash guard. Just need to attach a wooden brush handle (25mm diameter) and your ready to screed. Pre drilled hole in the stem to locate and secure the handle with a screw or nail. The spiked shoes are also used along with spiked screed roller.