Glass Drill Bits Chamfer Cover DB-A

Diamond countersink sleeve is also known as  drilling countersink drill bit , it is used for glass chamfer , matched with diamond drill bit for drilling hole on glass, ceramic, tile, etc. It's high efficiency , long life , safe and smooth drilling , which is an ideal partner to drill perfect hole without cracking edge.

*Super hard diamond material  *Wear-resisting won't  *Good comcentricity and sharp tip  

*For diamond drill bit apare part