SGerste Diamond Coated Hole Saw Drill Bit - 10 Diamond+Steel 1mm

Specifications: Material: Diamond+Steel Color: Silver Shank Diameter: 2.35mm/0.09"" Head Diameter: 1mm/0.04"" Sand length: About 17mm/0.67"" Full length: Approx. 42mm/1.65"" Size: 42 x 2.35MM/1.65x0.09""( L x Dia) Weight:10g Feature: 1.Suitable for Jade agate, jade pearl shells, and carved grinding head holing needle bit crystal lettering 2.Made of Diamond and durable 3.Corundum tools by grinding machining, and drill slowly., or flour is not easy to rule out, tools (especially the small tools) is also easy to damage 4.Please add water for coolant before you use Package Include: 10 x Diamond Coated Hole Saw Drill Bits