Features:Single BulbHigh Quality PMMAfrom ScratchesHigh Optical Brightness MaterialPrecision Machined Inner RadiusBlack Lines, Internally Mounted Give Minimal Parallax ErrorsThese Level Vials are ideal for adding to all stationary equipment that can be aligned, such as furnaces, refrigerators, washing machines, milling equipment, refrigeration equipment, heat pumps, stoves, air loaders, RVs, and any tool, appliance, or facility where the level is valid. Add one to many hand tools so you know when you're working on a level. These level vials are more durable than most OEM level vials built into hand tools, and they are thicker and stronger. Specifications: Material: PMMAK Liquid Color: Green/Blue Parting Line Color: Black Size: 10 x10x2 9mm/0.39x0.39x1.14" Quantity: 5 Pcs/1 Set Note: Please allow 1-3mm error due to manual measurement. Pls make sure you do not mind before you bid, due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Non-retail Package Contents: 5 x Bubble Level