Product List: 1 Triple Square Spline Bit Socket Set, 19cmx13cmx4cmWide Application: Triple Square Spline Bit Socket Set is suitable for a variety of jobs that require fasteners or bolts, such as cars, trucks, lawn equipment, machinery, etcIncludes a storage box: Spline Bit Socket Set includes a storage box for users to store and manage the sockets. Made of chrome-molybdenum steelSize: Spline Bit Socket Set size and chamfered end design can be smoothly inserted into fasteners while protecting the drill head and fasteners from damageBatch bit model: The batch bit model is M4-18, and the square head specifications include 1/2" (12.6mm), 3/8" (10mm) and 1/4" (6.35mm) Specification: Material: Chrome molybdenum steel Size Chart: 19cmx13cmx4cm/7.48inchx5.12inchx1.57inch Package Includes: 1 Drill Head Socket Set (10 pieces) Note: Please allow slightly errors due to manual measurement and different screen.