Well I ordered these knowing full well it was an 8mm shank. Of course it fits perfectly with my 8mm collet. It's not ideal for a 5/16 collet. That was to be expected since the stock was lasered in 8x8. The cutting width was exactly the same as the shank at 8mm. It's definitely not hard metal. It is light color and light steel. I wouldn't call this a high quality bat; However, it's not bad if you know what you're buying and it suits your purpose. I've used mine for roughing hardwood and it's been fine. Ideal for this purpose.
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