1) 5 pieces of diamond drill bit 4, 6, 8, 10 ,12MM 2) with guide system and water system 3) electroplated diamond,easy to use 1) 5 pieces of diamond drill bit ΓΈ4, 6, 8, 10 ,12MM2) with guide system and water system3) electroplated diamond,easy to use4) the diamond grid is 46#5) package: double blister6) easy to use and high efficiency7) safety and scientifically