Drill Bit Extension5 PCS Quick Release Magnetic Drill Bit HolderPRODUCT SPECIFICATION:MATERIAL: SteelHEX SHANK: 1/4 inchLength: 60mm (2.4inch) PRODUCT FEATURES:? [PREMIUM MATERIAL]-This drill bit extension set is made of industrial grade heavy-duty chrome-vanadium steel, durable, withstanding high pressure ? [STRONG MAGNETISIM]Locking mechanism and strong built-in magnetism make the drill bit holder easy to pop up batch head automatically, fast and quick release ensured.? [DIMENSION]60mm (2.4inch) long quick release magnetic drill bit extension with universal 1/4inch driver adapter and 1/4 inch hex shank, fitting most tools ? [WIDELY-USED]-In installation of pneumatic screwdriver, electric screwdriver, pneumatic drill, manual screwdriver and other installation for the hexagonal tool . A must-have package for conversion. Great for DIY work, household maintenance, and most general repairs, not for industrial work. A great tool addition to any tool box set. ? [FINE WORKMANSHIP]Excellent surface coating provides extra protection from damage against elements and substances such as oil and fluids that may come in contact with the extension bars during usage.