Product Descriptions Application This tool is used on both the older 15mm turbocharger bolts on Cummins ISB 5.9L and 6.7L Turbo Diesel Engines and the newer 12mm Turbocharger bolts on Cummins ISB 5.9L and 6.7L Turbo Diesel Engines. ? Design This is a 12mm & 15mm 12-point wrench with a 1/2" drive. ? Material Made of high-strength hardened steel, which has high hardness, high strength, with stable performance and reliable use and longer service life ? Package Content 1 x 12MM Turbo Charger Bolt Wrench Tool (12MM Version of 15MM 9866B 9866A 9866) 1 x 15MM 9866B 9866A 9866 Turbo Charger Bolt Wrench Tool Alt .