Press button to lock shaft・ loosen the collet nut. Insert the bit・ and tighten the collet securely.<br />1 Pen Shape electric Nail Drill for Nail Art Manicure &amp;amp; Pedicure Nail Polisher<br />Electric Nail Art File Drilling Hand-piece Machine<br />Comes with 6 Bits (5 diamond bits・ 1 emery rod with 6 sanding bands) and Cord<br /><br />COMES WITH AC Power CORD<br />To Get the Drill Bits In push down and hold the silver button then turn the end where the bit goes in then put the bit it then turn it back the other way to lock it now you can let go of the button<br /><br />Product Details:<br />100% Brand new Electric Nail Art Drill<br />Variable speed control: 3・000 RPM up to 20・000 RPM<br />Handpiece can directly connected to electricity・ easy to carry around! <br />Light-weight design for precise operation!<br />Quiet and smooth<br />Suitable for pedicure and manicure<br />The nail file can be used for natural nails as well as artificial nails<br />For professional studio use or home use<br />Style : US /EU<br />Voltage: 110V - 240V <br />Size: 6.2&amp;quot; INCHES 16cm (L) x 2.4cm (Diameter of handpiece)<br />Operation Detail:<br />Plug in the electric cord to the main electric outlet<br />Select the desired speed by turning the variable speed control knob on the handpiece <br />To secure the bits: push in the desired bit firmly into the hole<br />To remove the bits: turn off the machine and gently pull the bit out.<br />can be used for many othe