Shop quality 100-3C Clamp quickly adjusts to fit any frame tube up to 1-5/8" (41mm) * Clamp rotates 360 degrees for easy access to any part of the bike * Clamp height is adjustable from 50 to 62" (127-158cm) * Large diameter upright tubing resists flex * Bolts directly to the floor or to the 68 lbs 130 base (sold separately), ensuring rock solid stability