Made from heat-treated, high-strength molybdenum alloy steel ARP Pro Series high strength M10x22x1mm bolt Premium Pro Series bolt for engines, transmissions, etc. Made from heat-treated, high-strength molybdenum alloy steel ARP Pro Series flywheel bolts are made from heat-treated, high-strength molybdenum alloy steel. These reinforced bolts are highly recommended for performance-enhanced engines, as OEM bolts may loosen under increased power and/or RPM. ARP bolts can also be reused after installation. Technical Specifications: Thread: M10x1mm Thread length: 16.7mm Head height with flange: 9.25mm Shaft length: 4mm Shaft diameter: 9.90mm Tensile strength: Approximately 1310 N/mm² Tool head: 12-point 13mm Fits: Universal Included in Delivery: 1x ARP Bolt M10x22x1mm Note: We also offer ARP Ultra-Torque assembly lubricant, TZ part number: 496204