Feature SCFRC-01 Frenzy 1x22x32 All-Weather Cover Designed for Red Dots with Dual Rear Screws, Like Red Dot Sight SCRD-SM44* Converts Open Red Dot into Enclosed Red Dot for All-Weather Performance Durable Aluminum Housing Blocks Water, Dust, and Debris Yet Cleans Easily Installs Securely with T10 Torx Wrench Without Changing the Sight&';s Original Size *Note: Earlier Versions Without Dual Rear Screws Do Not Support Installation Specification SCFRC-01 Frenzy 1x22x32 All-Weather Cover Specification Details Length 40 mm / 1.57 in Width 41 mm / 1.61 in Height 34 mm / 1.34 in Screw Spec M3x8 Thread Pitch 0.5 mm / 0.02 in Tool Type T10 Torx L-Wrench (Included) Material 6061-T6 Aluminum Alloy Size