●10 pieces = 7 pieces diamond drill bit (6/6/8/20/35/50/68 mm); 1 piece 10 mm diamond finger cutter; 1 piece 50 mm finger cutter; 1 piece adapter ●Dry or wet drilling for tiles ceramic granite marble stone ●Diamond drill bit: diamond height 15 mm; total length: 60 mm; M14 thread ●10 mm diamond finger cutter usable length: 50 mm; total length: 75 mm; M14 thread; grit: #50/60 dry or wet using for enlarging, shaping and/or rounding bevel existing holes in porcelain, marble, granite and hard ceramic ●Adapter: M14 male thread; 3/8 inch hex shank; total length: 55 mm; shaft length: 28 mm M14 taps can be attached to hand drills or electric drills