Originally Posted by
Jonny5
I believe they are 1.1mm. GMK Supply has a nice pin vise/drill set called the "hole thing" that has every size you'll need to drill pistons. Its around $15 and worth every penny. Either way, you'll need to drill the Serpent pistons to the desired size.
Thanks. Hope these will smooth out the shock and it's not a faulty shock body. With the stock pistons, it feels tighter near the bottom of the body.