18" Top Reading Aluminum Level With Rule, 3 Vial, Mid Size Extruded Aluminum Frame With Clear Silver Anodized Finish & Top Reading Level Vial Window, Ruled Edge In 1/8ths, 1/16ths & CM, 360 Degree Reading Acrylic Yellow Barrel Vials, Shock Protecting End Caps, Frame Dimensions: 1" x 2-1/8".