Square Hole Mortise Chisel Drill Bit Tools, HSS Woodworking Hole Saw Mortising Chisel Drill Bit Set Twist Drill, Different Sizes 1/4" 5/16" 3/8" 1/2" 9/16" 5/8"(6pcs)

I didn’t buy to use with a mortiser. I intended to use to make square holes for my railing balusters. Work well and have stayed sharp. Getting the job done. Now I am looking at getting a mortiser to do more wood work.

Saw these advertised on Instagram and great value in Amazon. Great value and great addition the work bench

You need to get an adapter for the drill, otherwise these bits will stay loose and not work making the square hole

Very Satisfied with Quality and price

Several of the square chisel blades were dented. I returned them unused.

Bits are all labeled in mm, so takes a little figuring to convert to standard. I had to hone them a bit because they had some burrs on the cutting edge. they aren't particularly hard but seem to hold up ok.

did not like the fact that all bits had only metric labels

Square hole drill bits. These work well. Their manufacturing finish are rough, compared to what I am use to in the US. Still, you get what you pay for. No issues, yet with their performance. Time will tell.