The bluespot 9 piece 1 2 drive impact spline socket bit set is a comprehensive set of s2 steel spline bits designed for removing and applying spline fittings across a wide range of applications. Manufactured from s2 steel and heat-treated, hardened, and tempered, these bits are built to withstand the demands of regular professional use. The set covers the most widely used spline sizes, ranging from m6 to m18, making it a practical choice for mechanics, automotive technicians, and general tradespeople working with spline fasteners. The 1 2 drive format ensures broad compatibility, allowing these bits to be used with ratchets, breaker bars, and air tools giving you the flexibility to tackle both hand-torqued and power-assisted tasks with the same set. Features and benefits: s2 steel construction for enhanced strength and durability heat-treated, hardened, and tempered for long-lasting performance covers m6 to m18 the most commonly used spline sizes compatible with ratchets, breaker bars, and air tools 1 2 drive for versatile tool compatibility 9-piece set for comprehensive spline fitting coverage specifications: drive size: 1 2 socket type: spline range: m6 m18 number of pieces: 9 sizes included: m6, m8, m9, m10, m12, m14, m16, m18