RNK111
https://www.rnktools.com/products/carbide-drill-bit-for-cast-iron-alu.html
High-performance integral solid carbide drill bits for cast iron, self-centring. 4-face grinding, straight flutes for machining short-chip materials.
Specially designed for high-speed, high-feed drilling of aluminium and other easy-to-machine materials, with 5 times the diameter of the cutting edge, easy to resharpen the drill tip, and conducive to chip removal.