Diamond Coated Finger Bit, 3/4" Tile Milling Bit to Enlarge Grind Polish Shape Holes on Porcelain Ceramic Marble Granite Tile Countertop, with 5/8-11 Thread to 3/8" Hex Shank Adapter, Diameter 20mm

Additional Details from the Manufacturer

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More features

• 【Functions】: With our diamond finger bit, you can easily enlarge, shape, or round existing holes to create perfect smooth holes in different sizes.
• 【Applicable materials】: This 3/4" finger bit is suitable for shaping holes on porcelain hard ceramic marble granite tiles and other natural stones; fit both dry and wet applications
• 【Easy to Operate】: Our 3/4" finger bit (20mm) work with standard grinders with 5/8 inch-11 thread; there is a 5/8-11 Thread to 3/8" Hex Shank adapter included, so it will also work with most electric drills.
• 【Features】: Diamond Core Drill Bit with advanced Diamond coating ensures high efficiency and long life, diameter 3/4 inch (20mm), work length 50mm, total length 65mm.
• 【Recommendation】: For the best durability, we recommend only use this diamond finger bit to enlarge, shape, or round predrilled holes; and an RPM between 6000 to 11000 for optimal performance.