Was looking for a sharpening rod for a Bosch multi-tooth rotary hammer and this was found. That's not a spline, it's an eighth of a hexagon. Luckily I have a Bosch Brute Hammer that can use this tool.
π§± Bosch 2607017164 Piece Setter Masonry: Advanced Tools for Precision Masonry Work
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πͺ Durable DEWALT DW3986C Portable Blade 3 Pack for Efficient Cutting