I'll have to order some more stuff from tcmodels soon, Yep I love the BFast diff havn't had to adjust or worry about the diff at all since I got it
The 12.9 is the grade of the steel
"The lowest grade is 4.6, commonly known as commercial grade. Next comes grade 8.8, known as structural grade, and finally, the highest grade is 12.9, known as high tensile bolts."
They are very strong
