how far does the 'nose' extend past the hex piece on the coupler?

The needle extends about an inch and 1/2 past the hex.

When this is connected to the locknlube grease coupler does it leak?

Just like any grease fitting will leak a little it depends on the age and quality of the grease gun

will this work on mini grease fittings like on harbor freight angle die grinder?

The LockNLube Narrow Needle Dispenser is used by aiming the needle tip into the fitting you desire to grease and holding it in place

Maybe China? I am not sure. I use it about 3 times a week. It can be used to grease any type of fitting.

LockNLube Narrow Needle Dispenser

Product ID: 63824639

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📏5.5 x 3 x 0.75 in

🔧Extra reach

⚖️1.34 oz

Description

🔩 Grease the wheels of innovation with precision!

COMPACT DESIGN - Easily fits into tight spaces for those hard-to-reach fittings.
PRECISION GREASING - Snaps onto jaw type couplers for pinpoint accuracy.
EFFORTLESS APPLICATION - Delivers a fine line of grease for various applications.
LIGHTWEIGHT CONVENIENCE - Weighs just 1.34 ounces for easy handling.
VERSATILE COMPATIBILITY - Works seamlessly with LockNLube Grease Coupler.

The LockNLube Narrow Needle Dispenser is designed for professionals seeking to efficiently grease hard-to-reach fittings. Weighing only 1.34 ounces and measuring 5.5 x 3 x 0.75 inches, this tool snaps directly onto jaw type couplers, ensuring a precise application of grease in tight spaces. Ideal for use with hand-operated grease guns, it delivers a fine line of grease, making it a must-have for any maintenance toolkit.

Specifications

Manufacturer	LockNLube
Part Number	LNL122
Item Weight	1.34 ounces
Product Dimensions	5.5 x 3 x 0.75 inches
Item model number	LNL122
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

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