Features:_x000D_1. Open holes neat, smooth, no broken edge, will not produce tremor phenomenon. Cuts perfectly round holes without chipping or breaking the material._x000D_2. Incision resistance is small, opening speed, chip removal easily._x000D_3. Can be used for glass, ceramics, marble and other hard and brittle materials drilling._x000D_4. This diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic, concrete or other._x000D_5. Can be used with a standard electric drill._x000D_Notice:_x000D_1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow slight deviation due to manual measurement._x000D_Specification:_x000D_Type:Hole Drilling Bit Set_x000D_Size: 681012mm_x000D_Model:_x000D_A: 4 x hole drilling bits_x000D_B: 4 x hole drilling bits 1 x Limitation platePackage List:_x000D_Choice 1A:_x000D_4 x hole drilling bits681012mmChoice 2B:_x000D_4 x hole drilling bits681012mm_x000D_1 x Limitation plate