Excellent tool for small size of area. It helps remove bubbles caused by entrapped air in floor levelling screeds (cement or epoxy resin based).Features:The self levelling roller are used for moving screed around any area comfortably whilst spreading.The spiked roller self levelling can helps remove 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.it only Just need to attach a wooden brush handle 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. Specification:Width: 500mm/19.7inNail length: 21mm (dia. 2.8-0.8)Roller diameter: 90mm/3.5inWeight: Approx.1780g/62.8ozPackage list:1 x Spiked Aeration RollerNote?Once you have used the spiked roller and wash thoroughly to remove any excess levelling compound or debris attached to the spiked rollers and roller frame or handle.