Alta Labs Altra 166 Spine Insert and Outsert Heavy 250 Spine | Premium Quality

Specifications

Weight—-50 grains

Material—-7075-T6 aluminum

WARNING: This product can expose you to chemicals including arsenic, which is known to the State ofCalifornia to cause cancer. For more information, go toWWW.P65WARNINGS.CA.GOV

Product Overview

Alta Labs Altra 166 Spine Insert and Outsert Heavy 250 Spine is the A.R.C.O.S. system built for Altra 166 shafts to improve durability and shot-to-shot consistency. The insert seats into the shaft at 0.875 inches, and the threaded outsert encapsulates the arrow end by 0.43 inches. Pre-installed rubber O-rings help lock everything in place to reduce vibration and support better concentricity for more precise downrange performance.

Key Features

• Designed for Altra 166 shafts using the A.R.C.O.S. concentric outset system
• Machined from 7075-T6 aluminum for strong, repeatable fit and durability
• Insert seats 0.875 inches into the arrow shaft for secure placement
• Outsert encapsulates the arrow end by 0.43 inches to reinforce alignment
• Pre-installed rubber O-rings reduce vibration and help maintain concentricity
• 50 grains total system weight for the Heavy 250 spine configuration (12 pack)

Dial in your arrow build with the Altra A.R.C.O.S. Heavy 250 spine insert and outsert set for tighter tuning and more consistent accuracy.