Precision-built outsert for Altra Arrows 166 shafts, designed to boost durability and downrange accuracy. Sold in a 12-pack, it’s a reliable upgrade for serious target and field shooters.

• Compatibility: Fits Altra Arrows 166 Shafts, ensuring a consistent, secure fit with your existing arrows.
• Material: Machined from 7075-T6 aluminum for high strength and durability in demanding field conditions.
• Secure insert depth: 0.875 inches of insert depth to ensure reliable, repeatable engagement with each shot.
• Outsert encapsulation: Outsert encapsulates the arrow end to 0.43 inches, providing added protection and stability.
• O-ring system: Pre-installed rubber O-rings reduce vibration and improve concentricity during flight.
• Pack quantity: Sold as a 12-pack to support multiple arrows and quick replacements in the field.
• Spine options: Available in four spine sizes—250, 300, 350, and 400—to match a wide range of arrows and tuning needs.
• Total weight: 50 grain total weight, balancing strength with flight performance.
• Insert weight compatibility: Accepts micro FMS insert weights for precise tuning of balance and flight path.

This outsert delivers consistent performance by combining a durable aluminum body with vibration-damping features and precise dimensions. The 0.875-inch insert depth standardizes fit across arrows, while the 0.43-inch encapsulation guards the tip and maintains concentric flight. Pre-installed O-rings minimize micro-vibrations for tighter groups, especially at longer ranges. With four spine options, you can tailor the setup to bow speed and target distance, and the 50gn total weight provides a stable footprint. Micro FMS insert weights allow fine-tuning for wind and stabilization, helping you achieve reliable accuracy across varying conditions.