Rapid installation for 1.75" OD tube used in Rockhard 4x4 Sport Cages, Poison Spyder or other fabricated frames using the same tube diameter. Very fine machining and black anodized for a superior look. Can be fitted in less than a minute and can be repositioned. Non-permanent - move to the perfect position, anytime. Simple 20mm ball to attach a (CF) Carbon Fiber Series arm (sold separately) Works with coated and uncoated Sport Cage finishes No drilling required!