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Durable: Made of stainless steel (including screws), durable and anti-rust. Curved Design: Tighten the screw holes more firmly and will not slip or damage the lens. Fit: It can separate 25mm lens to 120mm lens. Suitable for prisms for surveying and mapping, microscopes, bird watching scopes, etc. Double-Ended Design: One end flat, one end pointed, easy to use. Easy to Operate: Larger screws for easier handling and easier tightening of crossbars.