Type 304 Stainless Steel Rivets.  Yes, really!
The caps are 9.3mm.  They are thick enough to be fiber laser engraved and are durable and secure.  Of course any rivet is only secure if it’s properly set.  These do NOT have brass shafts, they are 100% Stainless Steel so they require more force to set (which is also why they do not come apart by even the strongest dog’s lunge).

Perfect for 2 layers of Standard Weight Biothane plus 1 layer of Super Heavy Weight Biothane.
Standard Weight is is .095″ – .105″ thick.  Super Heavy Weight is .14″ – .16.” thick.
The shaft on these Stainless Steel Rivets is 12.5mm long.   They will fasten materials that have a total thickness from .31 to .35 inches.

You should choose shorter shafts for 2 layers of Standard Weight Biothane .
You can find those by clicking here:  Standard Stainless Steel Rivets

You should choose slightly shorter shafts for 2 layers of Super Heavy Weight Biothane.
You can find those by clicking here:  Long Stainless Steel Rivets

Why is STAINLESS STEEL such a big deal?
I do not use plated metals because the plating often chips and wears through to the base metal over time.
I use only Stainless Steel for these reasons:
Stronger and Harder than Brass and doesn’t tarnish or turn green
Well-known for its antibacterial, hypoallergenic and hygienic properties, stainless steel is very easy to clean.

Designers often underestimate or overlook the values of Stainless because of what is viewed as the higher initial costs. However, when taking into consideration the longevity, durability and lack of maintenance needed, Stainless is often the best value option.

Setting tips:

The shaft has an indentation near the top that helps insure these rivets are secure once set.
On squishy materials, I use a 1/8″ hole to set them. On metal, I use a 5/32″ hole.

If you have a press, use a 9mm or 10mm Rivet Die. It must be ROUNDED, or you will flatten the beautiful smooth rounded tops and bottoms.  Please see the picture above of the dies I use.

These rivets require more force to set than plated or brass rivets. Stainless steel is a harder metal and not as malleable. More difficult to set but much more durable and strong once set.

Be advised… these are truly permanent fasteners. Trying to remove them without mangling your material is not likely!