18pcs A Set HSS Cobalt Drill Bit for Drilling Stainless CR-NI & Hard Steel 1-10.2MM<br /><br />Features:<br />Using M35 cobalt high speed steel that has good toughness， high wear resistance， and excellent cutting performance.<br />M35 cobalt high speed steel can enhance heat resistance， extend the service life， high efficiency.<br />For all types of metal punching. Hand drill or bench drill can be used.<br />Uses: used for drilling stainless steel， iron， copper， aluminum， wood and other materials.<br /><br />Specifications:<br />Material: M35 cobalt high speed steel<br />Size: 1mm-10.2mm (Please choose your desired Size)<br /> Diameter(mm)  Cutting length(mm)  Total length(mm)<br />        1                          12                           34<br />        2                          24                           49<br />       2.5                        30                           57<br />        3                          33                           61<br />       3.2                        36                           65<br />       3.3                        36                           65<br />       3.5                        39                           70<br />        4                          43                           75 <br />       4.5                        47                           80<br />        5                          52                           86<br />       5.5                        57                           93<br />        6                          57                           93<br />       6.5                        63                          101<br />       6.8                        69                          109<br />        8                          75                          117<br />       8.5                        75                          117<br />      10.2                       87                          133<br /><br /> Package included:<br />18pcs HSS cobalt drill bits