Feature 1Feature: These stud extractors are integrated concentric roller bearing type that is easy to operate, and won't damage the thread on the stud. 2Important Parameter: The socket stud screw remover set has a 1/2in drive, and four 6, 8, 10, 12mm sleeve, with hexagon screw stud design. 3Material: The socket stud screw extractor tool set is made of high strength chrome tangsten steel material, which has high toughness, impact resistant and durable. 4Fine Workmanship: Professional manufactured, exquisite workmanship with unique design, ensure stable performance and high reliability. 5Application: Manufactured with high precision, thickened material can perfectly fit with 21mm spanners (not included) with the hex drives on the top of the socket.Item Type:SocketStudScrewExtractorToolMaterial:Chrome tangsten steel .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Drive Size: 1/2inSleeve Size: Approx. 6mm/0.24in, 8mm/0.31in, 10mm/0.39in, 12mm/0.47inPackage List4 x Screw Extractor Tool1 x Box