1Space Saving: The wheel chocks are stackable, nestable and compact in design, thereby not occupying valuable storage space when not in use. 2Anti Slip Surface: Each block features a crumpled anti slip surface, offering reliable traction and stable holding power for increased safety. 3Triangular Shaped: Feature a durable and textured triangular design providing maximum traction and pulling power, can be quickly and easily installed in place without the need for heavy tools or equipment. 4Wide Application: The block chocks are perfect for chocking all types of vehicles, from cars and trucks to RVs and small aircraft, also applicable as leveling blocks, suitable for numerous locations. 5Heavy Duty: The wheel chocks are made of heavy duty materials for long lasting use, measure 8 x 4.7 x 4.7 inches and weigh 1.65 pounds, making them suitable for use with a variety of equipment.