Unbreakable, waterproof, shatterproof, designed to withstand harsh environments. Ideal for leveling RVs, trailers or trailers, large tools, tripods, cameras, pictures, mounts guns, furniture, appliances, machines, pool tables and 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 level measures 60mm x 45mm wide and contains two frame mounted liquid filled vials with 2 screw holes for use in assembly or to apply adhesive to the support or magnetic adsorption to the iron, without fixing screws. Ideal for motorhomes, handymen, carpenters, assembly furniture, installation people, campers, photographers, shooters, construction. Do it yourself Features: 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 body levels). Use for hanging pictures or other decorations. Very useful for leveling your RV or items in your RV. 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 level 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 liquid-filled vials marked for easy reading on a triangular plastic stand. The 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 holes to turn them into a rope level.