It fits on much tighter, there were bits of casting material or something left in the corners, and the key is a bit too wide so that it actually chiseled out the keyway on my cam putting it on. It has a dark grey, slightly pitted, slightly uneven, but very smooth surface. They good part is it seems very hard. They key showed no signs of wear even after being hammered onto the cam, and it completely resisted my attempted grinding with a stainless steel wheel.