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Their arbor is 5/8"-11 Female Thread.

This package carries (a):

(a) 1 Piece of 10mm / 3/8" Diameter Diamond Vacuum Brazed Coarse Finger Bit / Milling Bit / Zero tolerance grinding drum for stone granite marble porcelain ceramic sink hole.

Enlarge, shape and/or round bevel existing holes in Porcelain, Hard Ceramic, marble and granite.