The Ø1-inch optical brass washers provided by LBTEK can be used inside SM1 sleeves to separate optical components. They include washers in two specifications: 1 mm and 2 mm. Multiple washers can be stacked to create different thickness intervals between optical components. When using optical brass washers with convex optical components, ensure sufficient distance is maintained between the convex surfaces of the two optical elements to prevent damage to the convex surfaces of the optical components.