Exhaust & Heat Exchangers Split

Each.
Super Small on the outside to provide more spanner clearance needed to install exhaust & Inlet manifold systems.

It’s the perfect way to bolt on those really big full merged racing headers.
You’ll find lots of other ways to use these space saving 8 x 11mm nuts

bolt ,nut, washer, screw, fastener,

Dual Carburetor Manifolds & Exhaust manifolds this nut will save you hours of grief