The T-20 features the "Dino-Bite" locking system that insures tight, non-slip height adjustments. The "Dino-Bite" system uses two steel disks with interlocking teeth that are tightened together at any one of up to 9 different usable height positions. Adjustments are made easily by simply loosening the center knob, adjusting the stand to desired height position and then re-tightening the knob. All T-20's stands are solidly constructed with high-grade steel and computer-welded joints for consistent high-quality and years of reliability.