What are the maximum line diameters of both the small and large tighteners?

Small Figure 9 line diameter is roughly 1/16 of an inch. 50 lbs max rating on the tightener. Works fine for Hammock tarp, tent fly etc. Can't help you on the large one.

Or just learn to tie knots...?

True, but who remembers how tie a truckers knot or a taut-line hitch to put tension on a rope or cord holding something in place? Been using these for a couple of years and find them very functional and effective.

What load is this rated to hold?

I believe it's 150 pounds. They are meant strictly for cargo and tie down type applications and are not meant for load bearing. They can be used under tension but I wouldnt push the load past roughly half the stated limit, maybe to 80 pounds or less.

will it damage the rope after many small tension adjustments?

I have been using for several years now and love having this, & its counterpart (NITE IZE Figure 9 Carabiner Rope Tightener, Large), available to tie down loads in my truck bed or trailer. It depends on the condition and type of the rope used as to its wear. The teeth in the locking notch are not sharp enough to cut. But like anything else, there is normal wear on the rope used. So what I do, is to periodically adjust the rope so that the same area is not utilized for too long; thus, prolonging the use of the rope. Even though I have several of these F9L-02-01 and they work well, I prefer NITE IZE Figure 9 Carabiner Rope Tightener (Large) because they are more versatile. However, I never use either to tie down loads on roof racks or loads that would receive a lot of vibration or high cross winds during a haul. Even though you can tighten them securely, they have a tendency to loosen (this could be due to the type rope used) -- just a precaution.

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🔗 Tighten smarter, not harder—join the no-knot revolution!

LOAD READY RELIABILITY - Secure your gear confidently with a trusted, load-rated design.
EFFORTLESS TENSION CONTROL - Say goodbye to knots—tighten and release with ease every time.
LASER ENGRAVED INSTRUCTIONS - Built-in guide ensures flawless setup—no guesswork needed.
UNIVERSAL ROPE COMPATIBILITY - Works seamlessly with ropes from 1/8 to 3/8 inches thick.
DURABLE ALUMINUM CRAFTSMANSHIP - Lightweight yet rugged, engineered for lasting performance.

The Nite Ize Figure 9 Rope Tightener is a precision-engineered aluminum tool designed to eliminate knot tying for ropes between 1/8 and 3/8 inches. Compact and lightweight at just 3.5 inches, it offers effortless tensioning and quick release, backed by laser-engraved instructions for flawless use. Ideal for securing, lifting, and bundling loads with reliable, load-rated performance.

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RM120

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Malaysiastore

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Manufacturer	Nite Ize
Part Number	F9L-02-09
Item Weight	1 ounces
Product Dimensions	1 x 7 x 2 inches
Item model number	F9L-02-09
Is Discontinued By Manufacturer	No
Size	1 Count (Pack of 1)
Color	Silver
Material	Aluminum
Pattern	Metal
Item Package Quantity	1
Number Of Pieces	1
Measurement System	Metric
Usage	personal
Included Components	Unit^Instruction Guide
Batteries Included?	No
Batteries Required?	No
Warranty Description	All Nite Ize products purchased from authorized resellers are backed by our Worry-Free Guarantee.

Rope Tightener, 3-1/2 in., Aluminum, Silver

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