Surfaces ConcaveConcave surface is suitable for general and anti-slip purposes. SmoothSmooth surface is smoothed off after surface finishing process. SolidSolid gratings are produced by combining one side smooth or sanded composite panel with smooth surface gratings. SandedGratings can also be provided with a sanded surface applied with resin for achieving higher anti-slip quality. Sandwich PanelSandwich gratings which are solid on both sides. Chequered Plate EffectChequered plate effected gratings are another solid variant.