Unbreakable, waterproof, unbreakable, designed to withstand harsh environments. Ideal for leveling RVs, trailers or trailers, large tools, tripods, cameras, pictures, gun stands, furniture, appliances, machinery, pool tables and much more Small and easy to keep in a drawer, carry in a tool bag, put in a pocket for climbing a ladder, anywhere you need a cross-check level Each tier is 60mm x 45mm wide and contains two liquid filled vials mounted to the frame with 2 screw holes for mounting use or for applying adhesive to the stand or magnetic adsorption to the iron, withoutfixing screws. Ideal for RVers, DIYers, Carpenters, Furniture Assembly, Installation People, Campers, Photographers, Shooters, Construction. Do it yourself Characteristics: 4 pieces. The level allows you to check accuracy by turning the level to compare to your marked measurements. These small T-shaped spirit levels can be permanently mounted on a counter in your RV or on your furniture/machinery so you can always check if it is still level (Note: when mounting with screws,do not screw too tight to distort the levels of the body). Use to hang pictures or other decorations. Very useful for leveling your motorhome or items in your motorhome. Attach to the tongue or rear bumper of a trailer or RV to check the level of lift. Attaches to pool tables or ping pong tables for precise play. Use on machine tools ensuring level during use. Magnetism can be adsorbed on the iron, without screws. Use when leveling telescopes, cameras or other tripod mounted devices. Each tier has two screw holes for mounting and a flat back. Some like to use double-sided tape on the back. Each level consists of 2 vials filled with liquid marked for easy reading on a triangular standplastic. Small levels are so handy to keep in your tool bag or on the travel bag because they take up little space and weigh little. The holes are provided to be screwed to a surface permanently, but some use the holesto turn them into a chord level.