Is the spring also 316 stainless steel?

Yes, all the components(including the spring) are made of 316 stainless steel.

How would I attach a vintage key chain of my own to this? Jump ring + jewelry pliers?

That was how I attached mine to swivel, jump ring and small set of Jewler needle nose pliers. depending on vintage key chain durability! hope this helps.

I need to attach to flag groments. Is the 3.5 a larger clip end than the 2.75 is?

Yes, and the opening is bigger than 2.75 version

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SHONAN 2.75 Inch Swivel Eye Snap Hook, 2 Pack Marine Grade Scuba Bolt Snap, Single Ended Stainless Steel Flag Clips Swivel Snaps for Scuba Diving, Flag Pole Rope, Dog Leash, Camera Strap

Product ID: 347178185

Details

Brand
Color
Silver
Item dimensions L x W x H
2.75 x 1 x 0.5
Material
Stainless 316
Size
2.75 Inch 2

💪100 lbs safety working load

🔄360° swivel rotation

⚙️316 Marine-grade stainless steel

5.90 OMR

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Description

🔗 Lock in strength and style with SHONAN’s swivel snap hooks—because your gear deserves the best!

COMPACT STRONG - At 2.75 inches with a 0.4-inch eye diameter, it balances portability with a robust 100-pound load capacity.
EFFORTLESS 360 SWIVEL - Smooth single-handed operation with full rotation for ultimate clipping flexibility and stability.
MARINE GRADE DURABILITY - Crafted from premium 316 stainless steel for unbeatable rust and corrosion resistance in extreme environments.
TRUSTED QUALITY ASSURANCE - Backed by a 1-year warranty and top-rated by professionals, ensuring reliability you can count on.
VERSATILE MULTI USE DESIGN - Perfect for scuba gear, dog leashes, flag poles, camera straps, and more—your all-in-one heavy-duty snap hook.

The SHONAN 2.75 Inch Swivel Eye Snap Hook is a premium marine-grade 316 stainless steel snap hook designed for durability and corrosion resistance. Featuring a 360-degree swivel for easy one-handed use, it supports up to 100 pounds and fits a variety of applications including scuba diving, dog leashes, and flag poles. This 2-pack set combines compact size with professional-grade strength, backed by a 1-year warranty and excellent customer ratings.

Specifications

ASIN	B0933JFP4H
Best Sellers Rank	#5,049 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Bolt Snaps
Brand	Shonan.Systems
Color	Silver
Compatible Groove Diameter	0.38 inches
Customer Reviews	4.7 4.7 out of 5 stars (739)
Fastener Type	Snap
Finish Types	Polished
Item Diameter	0.5 inches
Item Dimensions	2.75 x 1 x 0.5 inches
Item Shape	Irregular Shape
Item Weight	1 ounces
Manufacturer	Shonan Ltd.
Material Type	Stainless Steel 316
Model	SSBS-18
Number Of Items	2
Number of Pieces	2
Part Number	SSBS-18
Screw Head Style	Round
Set Name	2-Piece Swivel Eye Snap Hook Set
Size Name	2.75 Inch, 2 Pack, Single Ended
Unit Count	2 Count
Warranty Description	1 year warranty

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5.90 OMR

Duties & taxes included

In stock

Sold byAmazon OMANDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to OMAN.

Secure transaction

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Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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