InlinePRO M10 Extreme Duty Head Studs - L15B7 L15BA L15BE L15CA (16+ Civic 1.5T, 18+ Accord 1.5T, 23+ Integra 1.5T) - HSK-L15B7Our Honda L15B7 L15CA Civic SI 1. 5 Turbo M series M10 Extreme Power head studs are made from the Highest Grade Super Alloy that have gone through rigorous heat treatment and testing. With a minimum tensile strength of 230kpsi, these are not prone to hydrogen embrittlement like the L19 H11 material and can be handled without worrying about failures. We use a True beam design all the way through the length of the stud resulting in better clamping force