Item Type: 12 Spline M9 Bit_x000D_ Material: Chrome Vanadium Alloy_x000D_ Diagonal: Approx. 8.6mm / 0.34in 112 SPLINE DESIGN: The screwdriver bit is designed with 12 spline, which greatly increases torsion transmission and operational performance. 2STANDARD SIZE: The M9 bit socket has a 8.6mm diagonal, with standard size for easy installation and stable operation, convenient and practical. 3EXCELLENT METAL: The bit is made of chromium vanadium alloy steel, with high hardness, wear resistance, oxidation resistance, and long service life. 4FINE PROCESSING: With exquisite workmanship, this 12 spline bit has reasonable specification to ensure accurate and reliable operation. 5APPLICABLE SCENE: This bit socket is widely used for car repair, equipment maintenance, industrial manufacturing, factory maintenance, etc.1 x Spline Bit