Size –6/6/8/10/25/35/50/68mm, diamond height 10mm, total length 60mm, M14 thread of the tile drill bit. Wide Application –Diamond core bits are worked great for dry drilling holes through porcelain tile, ceramics, bathroom tile, marble granite, stone, masonry, brick with ease, Using water could prolong the lifetime. Size Diamond chamfer bit :2 Inch (50mm), 46mm workable length, M14 Thread, Grit #80, total Length 55mm, Top Angle 60 degree. Size –1pc 3/8′(10mm), 40mm workable length, M14 Thread, Grit #45/50, toal Length 65mm Machine –Angle grinder M14 Thread. Wide Applications –Recommended for enlarging, shaping and/or round bevel existing holes in porcelain tile, ceramics, bathroom tile, marble and countertop with ease, necessary to accomodate pipes or electric wire lines.