Feature A Adjustable Fit: Compatible With 28-30mm Objective Lens Red Dot Sights A Upgraded Sleeve: Durable 6063-T6 Aluminum Alloy Frame With Acrylic Lens A Lightweight Design: Only 4.5 g (0.15 oz) For Easy Carry And Quick Handling A Reliable Protection: Shields Against Cracks, Dust, And Damage During Airsoft Use Fit for Fits Maverick SCRD-12\SCRD-12II\SCRD-PS12\SCRD-PD12\SCRD-GY12, Centurion SCRD-33 or 28.5-30mm Objective lens outer diameter Red Dot Scope (28.5-30mm is the diameter of the objective barrel, NOT the diameter of the objective lens) (Dot not fits Maverick Rubber Cover SCRD-38/39/41/42/51/60/61) There are protective films on the protective lens, which needs to be removed before use. Picture Specification A Length: 8mm / 0.3" A Cap Inside Diameter (Application For): Fit 28-30mm objective lens outer diameter A Cap Outside Diameter: 31.5mm A Weight: 4.5g / 0.15oz A Sleeve Material: 6063-T6 alluminum alloy A Lens Material: Acylic