I am new to leatherwork. I need to know how to punch holes through multiple layers of leather. I am using 8-10oz leather to make holsters. I have been using a drill with a tiny bit to make the holes through both layers so that the holes match up. I know this is not correct, but I have yet to find a good way to do this and ensure they line up. My holsters are turning out okay, but I want to do it right. Can someone let me know if they use their diamond awl to go through two layers at once? Can you let me know if there are different size diamond awls, and if so what size would you recommend. If you respond, pics would be great if possible. I really appreciate your time. I will attach a pic of a holster I did.