Grovtec US Inc Anschutz T-Nut Stud Adapter Black Hardcoat Anodized Steel & Aluminum Rifle The Anschutz Adaptor sets Are Designed To Convert a Pre-installed Anschutz Rail To a Picatinny Bipod Mount. It uses M-Lock Hardware And a Custom T-Nut. All Parts Are Steel And Aluminum With Type III Black Hard anodized Finish And Black Oxide Finishes. Model: Anschutz T-Nut Material: Steel & Aluminum