THIS IS A 12 PT 170,000 TENSILE STRENGTH WHICH IS STRONGER THEN GRADE 8 BOLTS . ITS 12 PT FOR A GREAT LOOK AND FITS IN THOSE HARD TO REACH SPOTS . IT FITS THE OLDS ROCKET PARTS INTAKE MANIFOLD . OFFENHAUSER PORTA SONIC , 4150 MONDELLO POSI FLOW INTAKE . OR SIMPLY ANY INTAKE THAT NEEDS 10 SHORT AND 2 LONG