The Altra Reinforced Concentric Outset System (A.R.C.O.S.) is designed for Altra Arrows 204 Shafts, offering unmatched durability and performance through its precise 7075-T6 aluminum construction. The insert secures into the arrow shaft at a depth of 0.875 inches, while the outsert threads directly onto the insert, encapsulating the leading end of the arrow by 0.43 inches for enhanced durability. Pre-installed rubber O-rings lock the outsert in place, reducing vibration and improving concentricity for a more precise arrow setup and increased downrange accuracy.

Features:Fits Altra Arrows 204 Shafts; Constructed from 7075-T6 aluminum for durability; Secure insert depth: 0.875 inches; Outsert encapsulates arrow end: 0.43 inches; Pre-installed rubber O-rings reduce vibration and improve concentricity; Comes in 12 pk QTY; Available in four sizes: 250, 300, 350, & 400 spine; 53gn Total Weight; Accepts micro FMS insert weights; Enhances downrange accuracy and precision