if i remember it was a 150. the negative areas are extreme. i'm going to make at least one. i'm thinking this geometry may buckle under using it in steel. i'll let everyone know how such turns out. as they say, nothing ventured, nothing gainedLooks like a 120-130 degree v graver with the relief section grinded back
tyvm sam. i used the grs dual angler and some diamond wheels & burs in a micro motor. i found it to be a bit of a bugger to control. mitch was right. for me at least it was a fun xperiment.I have made these by sharpening a normal 120 from carbide or HSS and then use a blue or grey wheel to grind away the underside. Alexandre and Johnny Oro both sharpen by hand with a micromotor. My way works fine but maybe theirs is better.
Here's a pic of a cobra graver that Alexandre sent to me.