Specification: Dia 40mm: total length 67mm; workable length 40mm;Hexagonal Shank; Grit #80; Top angle 53 degree. Not for drilling holes, but designed to enlarge, shape, polish, clean, trim, finish, round or bevel existing rough holes of marble ceramic porcelain tiles granite. Recommended machine: Hand drill. Please do not use the hammering mode and keep the drilling speed above 2000RPM. Dry or wet use. For dry use, please bring your protective gear to protect your eyes and mouth from dust. Wet use is less dusty, more conducive to heat dissipation, and can extend the life of the product wet use. Vacuum brazing technology keeps grit 80 diamonds more exposed for better working effect.
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