These round head bits make a smaller hole. You must use a smaller needle to tap a bullseye or you can chip the glass because our regular needle is fatter than the drilled hole.The drill holes will be barely visible when finished. The round heads also do not skip on the glass surface like the tapered can. Recommended if you have the Cordless 4.8 v Dremel Drill. Good for 10-15 drills.
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