Lincoln Electric Front Lens Cover, 1740, 1840 Series Price For: Each For Use With: VIKING(TM) 1740, 1840 Series Filter Shade: 3 Characteristics: Clear Thickness: 0.250" Item: Front Lens Cover Plate Size: 4.5" x 3.94" x .06" Type: Headgear Function: Improve Visibility and Reduces Eye Strain Helmet Accessory Grouping: Lens Covers Country of Origin (subject to change): China