1 Piece Durasight Z2 Alloy Base CVA Optima and Elite And Kodiak (Silver Finish) by Durasight Product Overview now offers the 1 Piece Durasight Z2 Alloy Base CVA Optima and Elite And Kodiak (Silver Finish). The Z2 Alloy Bases are 50% stronger than other aluminum bases for durability. The Z2 Weaver style scope bases provide maximum strength with an industrial spec powder coat finish and in silver. Durasite uses only grade 8 Torx screws to provide super-secure attachment and a Torx wrench is included. Specifications and Features: CVA Optima Elite CF & ML and All Optima and All Kodiak and Wolf and Winchester Apex and New Frontier Beartooth Aluminum Construction Torx Screws and Tool Included Silver Finish