Title: 406mmx 4x 13.5m Interlocking Kelly Bar for XCMG XR220D - The Ultimate Solution for Safe and Efficient Foundation Drilling   Introduction - What is 406mmx 4x 13.5m Interlocking Kelly Bar for XCMG XR220D?   The 406mmx 4x 13.5m Interlocking Kelly Bar is a cutting-edge drilling tool designed specifically for XCMG XR220D, a popular model of foundation drilling equipment used in...