Professional tool for commercial or occasional use Extra long spline bit sockets M4 - M10 spline bits Manufactured from chrome vanadium steel for strength and durability 3/8" square drive so will fit any 3/8" drive ratchets / bars etc... Extra long bits (110mm total length) so perfect for access into restricted confined spaces SET INCLUDES THE FOLOWING 1. M4 Spline Bit Socket - total length 110mm 2. M5 Spline Bit Socket - total length 110mm 3. M6 Spline Bit Socket - total length 110mm 4. M7 Spline Bit Socket - total length 110mm 5. M8 Spline Bit Socket - total length 110mm 6. M9 Spline Bit Socket - total length 110mm 7. M10 Spline Bit Socket - total length 110mm Comes in a blow molded case for easy storage and transportation