Titanium Bleed Nipples. Products available in: Rusty nipples can be problematic, replace corroded originals with our lightweight, durable rust resistant versions. Available in M7, M8 and M10 thread sizes to suit most makes of caliper. If your unsure which size you need please check against your model using our vehicle finder. Handy items when bleeding the system or overhauling your brakes to get you stopping in no time.