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20pcs 3mm shank diamond grinding burr drill bits sets for rotary tools diy crafts20pc 3mm shank diamond grinding burr drill bits sets for rotary tool features: 1, smooth and refine surfaces by using these diamond grinding head to polish metal, ceramics and marble ,ect. 2, ideal for smoothing interior surfaces, there are 45 interchangeable pieces for the rotary grinding and polishing tool. Specifications: material: felt fabric(head) + metal(shank) cone diameter:6mm(1, 4") cylindrical diameter: 6mm(1, 4") ball column diameter: 6mm(1, 4") bullet diameter: 6mm(1, 4") ball diameter : 6mm(1, 4") candle diameter: 6mm(1, 4") shank diameter: 3mm (1, 8") total length: 45mm (1 3, 4") color: as the picture shown package included: 3 x cone grinding heads 4 x cylindrical grinding heads 3 x bullet grinding heads 4 x ball grinding heads 3 x candle grinding heads 3 x ball column grinding heads