Altra Arrows 204 Insert and Outsert. 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. Specifications for Altra Arrows 204 Insert and Outsert: Manufacturer: Altra Arrows Color: Black Features of Altra Arrows 204 Insert and Outsert: 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 Package Contents: Altra Arrows 204 Insert and Outsert