Levelling Pads are designed to level or raise temporary or semi-permanent facilities such as shipping containers, site offices, mobile homes, trailers, tiny homes, and more. Simply stack pads to the desired height. Compared to concrete or wood alternatives, these pads are incredibly strong and durable — they will never rot, crack, splinter, or split. Alignment holes in two opposite corners allow rods (not included) to keep stacked pads in position.