Specification and size: 10.9 grade automotive bolt, M16 x 2 thread, lower head size of 4.05 inches, coated with anti-corrosion Dacromet coating
Wide compatibility: designed specifically for all 3rd and 4th generation LS engines, compatible with LS1、LS2、LS3、LS6、L59、L92、L96、L99、LC9、LH8、LMF、LMG、LY5、LM7、LR4、LQ4、LQ9(4.8L、5.3L、5.7L、6.0L、6.2L) Compatible. Excluding LS7 and LS9 models
Part numbers: 12557840 and 917-139, can achieve precise fit and optimal performance in General Motors harmonic balancer systems.
Bolt quality: It is a high-strength bolt with a strength of 10.9 level, made of high-quality metal and galvanized, with high strength and durability, anti-corrosion and anti rust properties, ensuring a tight connection between the engine starter and the engine without loosening
Easy to install: This product is simple to use and easy to operate. Its design is easy to install, so you can quickly and easily replace old installation kits.