Athlon Optics Argos BTR Scope Sunshade 56mm Mounting: Threaded for easy installation (Screws in, no tools needed) Length: 4 inches (approximately 101.6 mm) Weight: 2.3 oz (approximately 65.2 g) Finish: Matte Black Material: Aluminum Features: Provides a clear line of sight, reduces glare, and enhances vision clarity. Compatibility: Compatible with the following Athlon riflescopes: Argos BTR 10-40x56mm (SKU 214071) Argos BTR 8-34x56mm (SKU 214067) Argos BTR 6-24x56mm (SKU 214068) Argos BTR 4.5-18x56mm (SKU 214065) Helos BTR 6-24x56mm (SKU 214066)