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Ships within 48 hours · Estimated delivery Aug 18 - Aug 23
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Description
Altra 166 Spine Insert And Outsert Heavy 400 Spine 1 Dz.The Altra Reinforced Concentric Outset System (A. R. C. O. S.) for 166 Shafts is designed to deliver unmatched durability and performance. Crafted from 7075 T6 aluminum, this system includes an insert that 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. Pre installed rubber O rings help lock the outsert in place, reducing vibration
The Altra Reinforced Concentric Outset System (A.R.C.O.S.) for 166 Shafts is designed to deliver unmatched durability and performance. Crafted from 7075-T6 aluminum, this system includes an insert that 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. Pre-installed rubber O-rings help lock the outsert in place, reducing vibration and enhancing concentricity for a more precise arrow setup and improved downrange accuracy. Available in four spine sizes, the A.R.C.O.S. system is perfect for those seeking optimal fit and performance.Features:Fits Altra Arrows 166 Shafts;Machined from 7075-T6 aluminum for unmatched 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;50gn Total Weight;Accepts micro FMS insert weights;Enhances downrange accuracy and precision
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 4
Checkpoint
Size: 10.5 Wide, Color: Navy Grainy Leather
Good shoes, comfortable.
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Reviewed in the United States on April 26, 2026
★★★★★ 5
Great fit!!!
Size: 14, Color: Navy Grainy Leather
Love them. Great fit. Thanks
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Reviewed in the United States on June 11, 2026
★★★★★ 3
Que no tiene pasadores para apretar el zapato
Size: 7 Wide, Color: Black/Black
Que viene en tallas pequeñas y pensé que venían con lazos y no fue así, el resto esta bien el peso muy conveniente
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Reviewed in the United States on May 30, 2026
★★★★★ 5
Comfortable and stylish
Size: 12, Color: Black
I'm very pleased with these shoes. I rarely write reviews, but these are extremely comfortable and stylish. I bought a black pair and a brown paid. Many times I have to get a wide, but the standard size 12 fits me well. Easy to slip into, yet still snug while walking.
I feel like the price is reasonable too.
Good cushioning, not too thin of a sole.
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Reviewed in the United States on January 7, 2026
★★★★★ 5
Good looking shoe.
Size: 9 Wide, Color: Cognac
It's a good looking should which is true to size. Quality is good. However, it is not leather. Inner and outer covering are man made. For me, it's okay. I ordered a 9W which I knew would be no more than a triple E width. I'm actually a quadruple E width so it's taking a little longer to break in. I won't be using these as often as at this stage of my life, I don't have that have functions that require dressier shoes. I'm happy with this purchase, a good value for the price. The slip in feature works well like my Sketcher slip in.
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Reviewed in the United States on July 27, 2025