This set of spline bits is designed for use with a rotary hammer drill with a spline drive. This set of 4 comes in sizes M6, M8, M10, and M12. All bits are 12 point, and all are clearly and permanently marked on the side of the shank.

* This set has sizes M6, M8, M10, and M12 - the set weighs 7.3 ounces

* Designed for use with a rotary hammer drill with a spline drive (not included)

* Made of top quality, heavy duty chrome vanadium steel - stronger at high temperatures

* Each of these spline bits has a 12 point end - for extra torque

* These spline bits are useful in carpentry and masonry work