1. Made of high strength Cr-Mo steel with high hardness, these lug nut removal sockets are more sturdy and durable. 2. This is 14 pieces nut remover set that can be used with 3/8inch square drive wrench, ratchet, or breaker bar for removing , freeze, rusted, rounded-off bolts, nuts & screws. 3. Standard 3/8-inch drive and 1/4-inch hex drive to 3/8-inch drive adapter to let the extractors compatible with common or heavy-duty power tools, drivers and screwdrivers handle tools. 4. The 6-point spiral socket design allows a secure connection to the rounded-off fastener to be extracted. 5. These Locking Wheel Lug Nut Removal Tools fit hex heads sized 6.35mm(1/4inch), 8mm(5/16inch), 9.5mm(3/8inch), 10mm, 11mm(7/16inch), 12mm, 12.7mm(1/2inch), 13mm, 14mm(9/16inch), 16mm(5/8inch), 17mm, 17.5mm(11/16inch), 19mm(3/4inch) to quickly replace rusting, rounded, or stripped lug nuts and bolts. Colour:Black Material:steel Package Contents: 13 x Nut & Bolt Extractors 1 x Socket Adapter Bar