Comp-E, Super Flow, Stock and custom flanges.
Used for making custom turbo and fuel injection manifolds.
1/2" thick aluminum and made extra wide for large ports and its 1/2" thick!
Did we state that they are a full 1/2" thick!

Comp-E and Super Flow style
$45 for a pair

Stock style used on 040,041,043,044,050, SE-Comp,
Eliminator 2000 and Street Eliminator style heads.
$40 for a Pair