Hawke Sport Optics Metal Ocular Flip-up Covers Size 4 Black. Easy to operate using one hand the covers are designed to protect the lenses when not in use. Covers are easily installed and can be securely positioned to open in any desired direction. Compatible with 2015 collection onwards. Please note flip-up covers are not compatible with Frontier 30 SF and Frontier 30 riflescopes or XB/XB1 crossbow scopes. Specifications for Hawke Sport Optics Metal Ocular Flip-up Covers: Manufacturer: Hawke Sport Optics Color: Black Size: 4 Package Contents: Hawke Sport Optics Metal Ocular Flip-up Covers Hawke Sport Optics 61053: Metal Ocular Flip-up Covers Size 4 Black