Altra 204 Insert and Outsert 400 Spine 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
