Havis'' Heavy Duty Telescoping poles mount to the C-HDM-100 Series Bases and provide easy up and down adjustment to your computer mount. Heavy duty telescoping pole with precision machined solid billet aluminum clamp collar Manufactured from heavy gauge steel poles and close tolerance PVC bushings on all bearing surfaces Precision machined parts eliminate metal to metal contact and allow smooth movement during height adjustment Configurable for many universal laptop, keyboard and docking station mounts Bolts to C-HDM-100 series vehicle specific bases for easy installation (sold separately) Height adjustable with clamp collar latch to set telescoping height and 360° rotation Standard adjustable stop collar limits the computer from telescoping below desired height