80mm Serrated Hollow Core Diamond Drill Bits Hole Saw for Glass Tile Stone 1000 Grit [U Shaped Steel Shackle] -

[U Shaped Steel Shackle] - 38mm(1-1/2-inch) shackle internal height and 20mm(25/32-inch) shackle internal width

mostly for guiding or reducing friction in linear applications

this detachable backing is convenient to change out when used

electronic modifications

and other wood crafts

80mm Serrated Hollow Core Diamond Drill Bits Hole Saw for Glass Tile Stone 1000 Grit [U Shaped Steel Shackle] -The serrated drill bit increases the sharpness and opening speed. Sharper and more durable than ordinary electroplated drill bits, especially suitable for thick glass openings. (10mm thick glass generally has about 300 openings.) Using electroplated diamond (50 60 grits), the opener creates precise, smooth cuts with no broken edges. Nickel plating improves hardness, wear resistance, corrosion resistance, and greatly extends the drill bit life. Low