Lapidary Core Drill Set - 10pcs (6-30mm) 2500g Stone Type: (Optional) Peridot or

Stone Type: (Optional) Peridot or London Blue Topaz

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Lapidary Core Drill Set - 10pcs (6-30mm) 2500g Stone Type: (Optional) Peridot orDescription: This is a ten piece set of lapidary grade core drills. They are best suited for a drill press and are great for hollowing out the inside of stone ring shanks, as well as making large bead holes. Made In: China Drill Bit Sizes: 6, 8, 10, 12, 14, 16, 18, 20, 22, 30mm Shaft Diameters range from : 5. 4mm 8. 3mmOverall Length: 50mm Weight of all drill bits : 160g Quantity: 10 Piece set