A: China. The DeWalt's made in Germany are the ones to buy. Better
A: This drill bit is made in China.
A: I suggest you ask Dewalt instead of Home Depot with regard to the 135 degree versus the 120 degree angle you measured. They have a great support website.
A: I would suggest you contact the manufacturer for the discrepancy.
A: Yes it will.
A: Yes, It has a reduced shank diameter to 1/2"
A: yes it's made for a 1/2" drill
A: Yes, this bit will fit in a 1/2" drill.
A: 6” long… but it will not drill a clean 5” hole.
A: It is 6" long.