Constructed from chromevanadium steel for extra torque strength and longevity. Includes a sturdy blow molded case for storage when not in use. Works on cars, trucks, appliances, equipment, machinery, and other jobs requiring star fasteners/bolts. Star Bit Socket Set includes 9 pieces E10E24 and 7 pieces T30T70. Size range and contents: E10, E11, E12, E14, E16, E18, E20, E22, E24 T30, T40, T45, T50, T55, T60, T70 Performance and benefits: Durable chromevanadium steel construction for repeated use Wide range of star socket sizes to cover common fasteners Protected and organized storage in a blow molded case Use scenarios: Automotive and maintenance: servicing star fasteners on engine compartments, suspension components, and exhaust systems Home appliance and equipment service: repairing washers, dryers, lawn equipment, and power tools with star fasteners Machinery and industrial maintenance: maintaining heavy equipment and machinery that use star bolts and sockets