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Weights & Tools

Screw-in backweights for customizable FOC tuning and precision tools to keep your arrow builds dialed. Everything you need to build the perfect arrow.

10 Products 4mm & 5mm Backweights Arrow Spinners & Backweight Tools

BACKWEIGHTS

FOC Tuning

Screw-in backweights thread directly into any CMI insert, letting you fine-tune your arrow's Front of Center in 10, 25, or 50-grain increments. Available in 4mm and 5mm diameters. Sold in convenient 12-packs

TOOLS

PRECISION

Purpose-built tools for arrow builders. From our titanium collapsible arrow spinner to the adjustable backweight installation tool, every piece is CNC-machined for precision and durability.

Weights & Tools Guide

WHICH SETUP IS RIGHT FOR YOU?

Choosing the right backweights and tools depends on your shaft size, desired FOC, and how you build your arrows.

4MM / 4.5MM BACKWEIGHTS

Screw-in backweights for CMI 4mm and 4.5mm insert systems. Designed with a 6-40 thread pitch, they thread directly into compatible inserts to fine-tune your arrow’s Front of Center without replacing components.

  • 10gr, 25gr, 50gr options
  • Sold in 12-packs
  • Designed to thread into 4mm and 4.5mm inserts with a 6-40 thread pitch.
  • Best for: Light shafts & FOC tuning

5MM & LARGER BACKWEIGHTS

Screw-in backweights for CMI 5mm, 6mm, 6.5mm, and larger insert systems. Designed with standard 8-32 threading, they allow you to stack grain weight at the front of your arrow for higher FOC and improved penetration on big game

  • 10gr, 25gr, 50gr options
  • Sold in 12-packs
  • Threads into 5mm, 6mm, 6.5mm, and larger inserts with standard 8-32 threading.
  • Best for: Hunting & high FOC builds

ARROW SPINNER

Built with titanium rods, precision bearings, and billet aluminum end caps and center support, the CMI Arrow Spinner provides a strong, lightweight platform for checking arrow straightness, broadhead alignment, and overall build quality. Its collapsible design packs down easily for the field.

  • Titanium construction
  • Collapsible design
  • Checks spine & alignment
  • Best for: Arrow build quality control

BACKWEIGHT TOOLS

Adjustable backweight installation tool with adapters for 4mm, 5mm, 6mm, and 6.5mm shafts. Collapses from 10" to 35" for easy install on any arrow length.

  • 9/64" hex drive
  • 4mm – 6.5mm adapters
  • Collapsible 10"–35"
  • Best for: Clean installs

Reference

SPECIFICATION CHART

Compare every backweight, tool, and adapter side by side to plan your build.

Product Type Shaft Size Weight Pack Price
4MM Backweight, 10gr Backweight 4mm 10gr 12 Pack $10.99
4MM Backweight, 25gr Backweight 4mm 25gr 12 Pack $10.99
4MM Backweight, 50gr Backweight 4mm 50gr 12 Pack $10.99
5MM Backweight, 10gr Backweight 5mm 10gr 12 Pack $10.99
5MM Backweight, 25gr Backweight 5mm 25gr 12 Pack $10.99
5MM Backweight, 50gr Backweight 5mm 50gr 12 Pack $10.99
CMI Arrow Spinner Tool Universal — Single $59.99
CMI Backweight Tool Tool 4–6.5mm — Single $29.99
Backweight Tool Adapter 6mm Adapter 6mm — Single $12.99
Backweight Tool Adapter 6.5mm Adapter 6.5mm — Single $12.99

4MM Backweight, 10gr

$10.99
Type Backweight
Shaft Size 4mm
Weight 10gr
Pack 12 Pack

4MM Backweight, 25gr

$10.99
Type Backweight
Shaft Size 4mm
Weight 25gr
Pack 12 Pack

4MM Backweight, 50gr

$10.99
Type Backweight
Shaft Size 4mm
Weight 50gr
Pack 12 Pack

5MM Backweight, 10gr

$10.99
Type Backweight
Shaft Size 5mm
Weight 10gr
Pack 12 Pack

5MM Backweight, 25gr

$10.99
Type Backweight
Shaft Size 5mm
Weight 25gr
Pack 12 Pack

5MM Backweight, 50gr

$10.99
Type Backweight
Shaft Size 5mm
Weight 50gr
Pack 12 Pack

CMI Arrow Spinner

$59.99
Type Tool
Shaft Size Universal
Weight —
Pack Single

CMI Backweight Tool

$29.99
Type Tool
Shaft Size 4–6.5mm
Weight —
Pack Single

Backweight Tool Adapter 6mm

$12.99
Type Adapter
Shaft Size 6mm
Weight —
Pack Single

Backweight Tool Adapter 6.5mm

$12.99
Type Adapter
Shaft Size 6.5mm
Weight —
Pack Single