The 18-inch Leather Sheathed Spyglass Telescope produces a bright and sharp highly magnified image and is 2 1/8-inch (5.5 cm) in diameter and 6 5/8 in. (16.8 cm) long when collapsed. This 12-power telescope has four brass pipes, with the largest pipe being tapered. A built-in sunshade extends to reduce lens flare. When fully extended, the telescope measures 17 5/8 inches (44.8 cm) long. The diameter of the multi-coated objective lens is 37.25 mm. The telescope is solid, weighing over 1 pound, 4 ounces (578 grams). It is constructed entirely of threaded solid brass tubing and fittings with no glued components. A beautiful leather case also comes with the telescope.