The Altra 204 Insert and Outsert 350 Spine is a precision upgrade for Altra Arrows 204 shafts, designed for archers who demand consistent spine alignment and downrange accuracy.

• Compatibility: Specifically engineered to fit Altra Arrows 204 shafts, with four spine options (250, 300, 350, 400) to match draw weight and velocity.
• Material: Made from 7075-T6 aluminum for durable, rigid performance in flight and impact.
• Insert depth: Secure insert depth of 0.875 inches to ensure reliable, repeatable assembly.
• Outsert design: Outsert encapsulates the arrow end for 0.43 inches of end coverage, enhancing protection and concentricity.
• Vibration reduction: Pre-installed rubber O-rings dampen vibration and improve concentricity for steadier flight.
• Weight and customization: 53 grains total weight and compatibility with micro FMS insert weights for fine-tuning balance and flight characteristics.
• Pack size: Available in a 12-pack, simplifying replacement and consistent tuning across arrows.
• Performance benefit: Enhances downrange accuracy and precision by maintaining consistent spine and end-to-end alignment.

By combining a robust 7075-T6 aluminum insert with a protective outsert and precise tuning options, this kit helps archers achieve steadier flight, repeatable tuning, and cleaner impacts. The fixed 0.875" insert depth and 0.43" outsert coverage reduce play and wobble, while micro weight compatibility lets you dial in spine and point weight for your specific setup. Ideal for target shooting, field archery, and hunting where predictable flight and accuracy matter, these inserts provide a practical upgrade for Arrows 204 shafts when you want dependable performance over time.