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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Description

🔗 Master your load with zero knots, all control.

COMPACT LIGHTWEIGHT - Weighs just 28 grams, perfect for on-the-go professionals.
EFFORTLESS LOAD CONTROL - Say goodbye to knots—secure and release with a simple pull.
VERSATILE HANDLING TOOL - Ideal for pulling, lifting, lowering, and conveying tasks with ease.
LASER ENGRAVED INSTRUCTIONS - Built-in guidance ensures quick setup, even without language barriers.
DURABLE ALUMINUM CRAFTSMANSHIP - Engineered from high-quality aluminum for strength without bulk.

The Nite Ize Figure 9 (Silver, L) is a precision-engineered aluminum device designed for efficient material handling. Weighing only 28.3 grams and measuring compactly, it eliminates the hassle of knots with a patented tensioning system. Laser-engraved instructions simplify use, making it an essential tool for professionals seeking reliable, lightweight load control.

Specifications

Manufacturer	Nite Ize
Part Number	F9L-02-09
Product Dimensions	2.54 x 17.78 x 5.08 cm; 28.35 g
Item model number	F9L-02-09
Size	L
Colour	Silver
Style	L
Material	Aluminium
Pattern	Metal
Item Package Quantity	1
Number of Pieces	1
Measurement System	Metric
Usage	Personal
Included Components	Instructions not in English)
Batteries included?	No
Batteries Required?	No
Item Weight	28.3 g

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