Magnaflux SK-416 Crack Detection Kit - Find minute cracks in suspension, cylinder heads, and other engine and driveline parts. Easy to use aerosol cans of Cleaner, Dye Penetrant, and Developer make any crack in ferrous and non-ferrous metals show up as a bright red line. The Magnaflux SK-416 Crack Detection Kit includes 4 standard aerosol cans: 2- Cleaner/Remover, 1- Penetrant, 1- Developer, hand towels, wiping cloth, and instructions in a sturdy molded case.