Thanks for the reply folks. I’ve cut quite a few mortises with these chisels since the original post. The edges were very roughly machined when new. Some were also quite a bit oversized – somewhere in between imperial and metric. I smoothed off the sides mainly because they were very sharp and uncomfortable when pairing but also to get the sizes close to accurate. The handles were totally useless and required turning new ones that actually fit the sockets. A file could could remove the grind marks on a couple of the chisels. The cutting edge rolls over after a couple of chops with these ones. So much for quality control. My technique has improved and wood and grain direction are important as stated. But these chisels are an embarrassment to what’s left of Stanley Tool Works reputation. I guess I fell for the “Made I Sheffield” nonsense.