Features: Great Compatibility — Perfectly fit for Detroit Diesel DD13 and Detroit Diesel DD15. Superior Quality — Premium grade heavy duty soild steel structure with black oxide finished, durability, anti-impact, anti-deformation and anti-corrosion. Ultra-precise design meets the requirement of high precision and hardness and a much longer service life. Perfect Design — This tool is used with the DDC procedure to set the gear timing for cam installation. .