Firenock AeroOutsert (12-pack) — .166 / 4mm shafts

Ships in 3–5 business days on average. Firenock doesn't drop-ship — they send this to me first, then I ship it to you. Most orders leave 3–5 business days after you order, sometimes longer depending on when Firenock gets it to me. You'll get tracking the moment it's on its way.

Precision-forged 7075-T6 aluminum outsert collars for .166 (4mm) micro-diameter hunting shafts. Each size is matched to a specific shaft OD — pick the size that matches your shaft's measured outer diameter for true broadhead alignment.

Why these matter

• OD-matched fitment means no broadhead wobble, no spin-out, no group flyers
• Outsert design (not insert) keeps shaft wall thickness intact at the impact point
• 7075-T6 aluminum — 60% lighter than steel collars at the same strength

How to choose

Measure the OD of your shaft with calipers, then select the closest size below. Firenock makes these in 0.5-thou OD increments because micro-diameter tolerances vary by manufacturer.

12-pack.