Vde Injection Hex Key,En60900 Approved Hex Key,1000V Insulation Hex Key,1000V Injection Hex Key Shanghai Countool In't Trading Co.,ltd , https://www.countool.com The 12mm drill chuck of the drilling machine can not hold the handle of the larger tap, and there is no suitable tool to hold the tap at hand. The following method can be used to solve this problem. As shown in the figure, select a cylindrical pin with a diameter of φ8mm to match the key hole of the drill chuck, and take a curved tail of the chicken core to clamp the tap handle, and then clamp a small 60° center drill. In the middle of the chuck and tighten the tail of the tap