ARP 4303502 Starter Bolt Kit, Stainless Steel With Hex Style Heads, For Select Chevrolet Applications Simplifies starter motor installation in the cramped confines of a race car Features small diameter head and standard shank knurling; 3.700 under head length Manufactured from 100% maintenance free ARP 300 stainless steel Rated at 170,000 psi, which is stronger than Grade 8 hardware Designed for select Chevrolet applications, all standard, hex