The hex shank is universal, and this socket with high hardness and wearing feature can meet various working environments. There is a square hole in the apron, and the square hole is inlaid with a pad to make the clamping more firm, and it can be used with a hand electric drill. Made of high-quality alloy steel, this socket has high hardness. There are 8 specifications compatible your choice from M4 to M16. Their length is 50mm, and the shank diameter is 1/4-inch. It is suitable compatible car repair, mold making, manufacturing, etc. Item Name: Tap Socket Material: Alloy Steel Specification: M4, M5, M6, M8, M10, M12, M14, M16 Shank Type: Hex Shank Handle Diameter: 1/4-inch Size Details: Socket Length: 50mm/1.97" (Approx.) Shank Diameter: 1/4" M4: 5cm x 0.4cm x 0.4cm/1.97" x 0.16" x 0.16" (Approx.), Used Tap Edge Length: 0.3cm/0.12" (Approx.) M5: 5cm x 0.5cm x 0.5cm/1.97" x 0.2" x 0.2" (Approx.), Used Tap Edge Length: 0.4cm/0.16" (Approx.) M6: 5cm x 0.6cm x 0.6cm/1.97" x 0.24" x 0.24" (Approx.), Used Tap Edge Length: 0.48cm/0.19" (Approx.) M8: 5cm x 0.8cm x 0.8cm/1.97" x 0.31" x 0.31" (Approx.), Used Tap Edge Length: 0.5cm/0.2" (Approx.) M10: 5cm x 1cm x 1cm/1.97" x 0.39" x 0.39" (Approx.), Used Tap Edge Length: 0.6cm/0.24" (Approx.) M12: 5cm x 1.2cm x 1.2cm/1.97" x 0.47" x 0.47" (Approx.), Used Tap Edge Length: 0.7cm/0.28" (Approx.) M14: 5cm x 1.4cm x 1.4cm/1.97" x 0.55" x 0.55" (Approx.), Used Tap Edge Length: 0.9cm/0.35" (Approx.) M16: 5cm x 1.6cm x 1.6cm/1.97" x 0.63" x 0.63" (Approx.), Used Tap Edge Length: 1cm/0.39" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Tap Socket