Supply tree tree pool cover pool cover manufacturer tree grate size is generally 38 * 38 * 25, suitable for pedestrians. Tree pool cover glass steel grille design: 1. Measure the length of the Pits good size and diameter 2. Grate Tree tree requires two board stitching. Such as the size of the entire Pits 1 * 1 0.5 * need to cut two boards of stitching together a 3. If the diameter of the tree 20cm, 0.5 * need a board, along the edge of the cut off in the middle position 1m 20cm * gap of 30cm, after stitching together, we can guarantee the tree grate in the middle of the box size is 30 * 30cm ^ 2