Material: Made of chromium molybdenum steel for strength and durability. Multi-functional: The twist socket set is suitable for removing locking wheel nuts or damaged bolts. Surface Painting Process: These nut extractors have black phosphate surface for corrosion protection. Size: 1/2" drive; comes with 4 different sizes sockets (17mm, 19mm, 21mm & 22mm) for your need. Easy to Carry and Storage: Comes in handy blow moulded storage case. Product description: The twist socket set is suitable for most locking wheel nuts. Portable and easy to store, it comes with a sturdy plastic storage box, compact size, easy to carry. Specifications: Material: High Hardness Chrome Molybdenum Steel (for strength and durability) Color: Black phosphate surface (for corrosion protection) Socket Sizes available: 17mm, 19mm, 21mm, 22mm Drive: 1/2 inch Straight bar diameter: 12.7mm Straight bar length: 80mm Size: box size: 16*12*4.5 cm Weight: 810g Color: blue Package include4pcs * Twist Sockets1pc * Straight Bar