Is there a model with teeth?

Not from Knipex, unfortunately. However, this Gedore version has a serrated gripping area: https://www.amazon.com/dp/B000UZ36QA

Are these pliers rust resistant or better yet, rust proof?

if you keep them well lubed they will serve well, the premium chrome model 31 13 160 will be more naturally rust-resistant.

when you push side-to-side near the tip of the jaws, does the 2 halves of the jaw move side to side?

If you are asking if these are flimsy I can tell you they are not. These are very pricey and you do get what you pay for here. Keep in mind though that these are not heavy duty needle nose. You will not get a crushing grip with these as they are very job specific. Suitable in my opinion for electronic work and squeazing into extremely tight or narrow spots. As an electrician I use them usually if something is just beyond reach in a narrow hole that my other needlenose are too beefy for. I hardly ever break them out but when you do need a grabbing tool as narrow as these, they become a lifesaver and you're thrilled to have them.

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KNIPEX - 31 11 160 Tools - Needle Nose Pliers (3111160)

KNIPEX - 31 11 160 Tools - Needle Nose Pliers (3111160)

Product ID: 12143028

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Details

Brand
KNIPEX
Material
Blend
Product Dimensions
7"L x 1.9"W
Color
Multi
Handle Material
Plastic
Item Weight
0.05 Pounds

📏55mm extra-long jaws for precision reach

🛠️Ergonomic grip for all-day comfort

🇩🇪Made in Germany - trusted durability

Description

🔧 Master every detail with precision-crafted power.

COMFORT MEETS CONTROL - Ergonomic plastic handles reduce hand fatigue during extended use.
HERITAGE OF EXCELLENCE - Crafted by KNIPEX, Europe's leading pliers manufacturer since 1882.
ENGINEERED FOR ENDURANCE - Tested in real-world conditions to ensure lasting performance.
PRECISION REACH NO COMPROMISE - Extra-long 55mm jaws get into tight spots others can't touch.
SUSTAINABLY BUILT READY TO WORK - RoHS and DIN ISO 5745 certified for quality and eco-conscious standards.

The KNIPEX 31 11 160 Needle Nose Pliers combine German engineering with ergonomic design, featuring 55mm extra-long jaws for precision tasks in tight spaces. Built for durability and comfort, these pliers meet strict quality and sustainability standards, making them the go-to tool for professionals and enthusiasts alike.

Specifications

Brand	KNIPEX
Material	Blend
Product Dimensions	7"L x 1.9"W
Color	Multi
Handle Material	Plastic
Item Weight	0.05 Pounds
Specific Uses For Product	Service Field
Specification Met	DIN ISO 5745, RoHS
Grip Type	Ergonomic
Cutting Width	55 Millimeters
UPC	843221001643
Global Trade Identification Number	00843221001643
Manufacturer	Knipex Tools
Part Number	31 11 160
Item Weight	0.8 ounces
Item model number	3111160
Is Discontinued By Manufacturer	No
Size	6.25
Style	Pliers
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Item Package Quantity	1
Number Of Pieces	1
Included Components	Knipex - 31 11 160
Batteries Included?	No
Batteries Required?	No
Warranty Description	Workmanship and Materials