This tube holder is massive and easily capable of providing an abolutely solid and secure way to hold the FS-152 for visual and CCD observing. It is a clamshell design, lined with thick felt, with a large, easy to find knob on one side that tightens a clamping screw to adjust the clamshell tension. The tube holder has a 1/4-20 screw on the top for mounting accessories or a camera. The quality of design, fit and finish are as good as it gets.