USED Hawke Sport Optics Metal Flip Up Covers 40mm AO Objective Black. Covers are easily installed and can be securely positioned to open in any desired direction. Compatible with 2015 collection onwards. Easy to operate using one hand the covers are designed to protect the lenses when not in use. 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 AO Objective Metal Flip Up Cover: Manufacturer: Hawke Sport Optics Finish: Matte Fabric/Material: Aluminum Size: Standard Color: Black Gun Make: Universal Gun Type: Rifle Gun Model: Universal Package Contents: Hawke Sport Optics Metal Flip Up Cover What firearm models does the manufacturer say Hawke Sport Optics AO Objective Metal Flip Up Cover is compatible with? The manufacturer says that Hawke Sport Optics AO Objective Metal Flip Up Cover is compatible with UniversalHawke Sport Optics 61004: Metal Flip Up Covers 40mm AO Objective Black