Orion Motor Tech 131PC SAE Thread Repair Kit, HSS Drill Helicoil Kit Standard, 1/4" 5/16" 3/8" 7/16" 1/2"

What size is the 7/16 thread? 7/16-14 or a 7/16-20 thread???

Where can I find additional coils? I need some that are longer

What are specs on the extra helicoil hardware that is included? no need to give info for all, just the m5, m6, and m8 sizes.

Is the standard S.A.E. 5/16" helicoil - 24 threads per inch?