"For flattening, finishing and ruling off. Compatible with all gypsum based plasters (hand & spray applied), traditional sand and cement renders, and insulated rendering systems. Comes complete with integral blade guard. It has Strategic ribs on the ST blade grip and distribute the plaster material leaving the surface incredibly flat. The rib design reduces surface moisture through reduced sound vibration, crucial to shortening overall working time Typically knocks 40 minutes off plastering time"