This 10 pcs white steel drill bits are for DIY grinding and punching (wood, metal, mold polishing purposes). These are high quality white steel drill bits for electric grinding accessories. Can be used for drilling, such as metal, plastic,aluminium and wood, good wear resistance, punching strength is strong.<by/>Features:<by />Can be used for punching, such as metal, plastic,aluminium and wood.<by />Good wear resistance.<by />High working efficiency, perfect punching effect and long using life.<by />Convenient to drilling, simple to use, safe and reliable.<by />Widely used in precision punching technology and slotting, such as vajra bodhi olive nuclear walnut punching.<by/>Specifications:<by />Color: Silver<by />Material: White Steel<by />Diameter: 0.5;0.6;0.8;1.0;1.2;1.5;1.8;2.0;2.5;3.0mm / 0.02;0.02;0.03;0.04;0.05;0.06;0.07;0.08;0.10;0.11in <by />Diameter           Length<by />0.5mm             23mm   <by />0.6mm             29mm          <by />0.8mm             35mm          <by />1.0mm             34mm         <by />1.2mm             43mm      <by />1.5mm             49mm      <by />1.8mm             51mm       <by />2.0mm             51mm       <by />2.5mm             60mm<by />3.0mm             61mm   <by />Item Weight: Approx. 6.8g / 0.2oz &#xff08;10 Pcs)<by />Package Size: Approx. 9 * 6 * 0.4cm / 3.5 * 2.4 * 0.1in<by />Package Weight: Approx. 7.6g / 0.3oz<by/>Package List:<by />10 * White Steel Drill Bits