Feature A Perfect Fit: Designed Exclusively for 29.0-29.3mm (1.15") Objective Lens Red Dot Sights A All-in-One Kit: Complete Package Includes Everything Needed for Quick Installation A Lightweight Design: Only 7 g (0.25 oz) with 6063-T6 Aluminum Alloy Frame and Tough Acrylic Shield A Lens Protection: Prevents Cracks and Damage During Airsoft Sporting Use *Fits Maverick SCRD-12 SCRD-12II , Harpy SCRD-30 (Dot not fits Maverick Rubber Cover SCRD-38/39/41/42) Picture Specification A Internal Dia.: 29.5mm (1.16") A Length: 10.5mm (0.4") A Weight (net): 7g (0.25oz) A Material: 6063-T6 A Finish: Black matte A Lens Material: Acrylic A Rings Material: Rubber A Directly put it onto the red dot socpe objective lens after filling two O rings inside A Only fit 29mm to 29.3mm objective lens