10Pcs Diamond Ball Sphere Head Drill Bits, Grinding Mounted Point Burr Bit Rotary Tools for Carving, Etching, Sanding (3x4mm)

• Electroplated emery material, which is strong and durable, can use for a long time.
• These ball shape drill bits are lightweight, compact and easy to handle.
• 3mm diameter shank compatible with most electric grinder, engraving machine.
• Perfect for jewelers, craft hobbyists, modelers, and other professions.
• It should be cooling with water when use it, keep motionless to install it, and cannot too forcibly to use It.

Features： Coated with tough diamond particle at head Great for carving, etching, grinding, sanding, etc Ideal for glass, metal, stone, tile, ceramics and more Perfect for jewelers, craft hobbyists, modelers, and other professions Note: It should be cooling with water when use it, keep motionless to install it, and cannot too forcibly to use It. Specification: Total length: Approx. 45mm / 1.77 inch Shank diameter: Approx.3mm / 0.12 inch Frosted ball diameter: Approx. 2mm/3mm/ 3.5mm/4mm Grit: 150# Needle tip shape: Ball shape Material: Diamond Color: Silvery tone Package included: 1 set Diamond Ball Shape Burrs