After years of research and testing Park Tool have built what it considers the best shop clamp made.It's smooth, versatile and built to stand up to everyday shop use.Cam-actuated adjustment system for quick entry, adjustment and exit.Fully adjustable clamping pressure prevents damage to thin-walled tubes.Handy spinner handle speeds large size range adjustments.Grips nearly any tube from 7/8 inches to 3 inches (23-76mm), including aero tubes.Narrow clamping jaws (2.7 inches / 7cm) fit into tight areas or on short seat posts.Precision machined, die-cast aluminium main body parts and high quality small parts.Durable powder coat finish.Soft, durable composite rubber jaw covers.Saddle cradle provides a perfect spot to temporarily rest a bike.Three versions available to allow the Micro-adjust clamp to fit all these work stands: PCS1,4,7,10,11,12 and PRS 2,3,4, and PRS 2,3,4 OS.Made in the USA and covered by Park Tool's legendary limited lifetime warranty