Cam-actuated adjustment system for quick entry, adjustment and exit Fully adjustable clamping pressure prevents damage to thinwalled tubes Grip nearly any tube from 7/8" to 3" (2376mm), including aero tubes Narrow clamping jaws (2.7" / 7cm) fit into tight areas or on short seat posts Soft, durable composite rubber jaw covers Retailers are not permitted to sell on the Amazon.com marketplace unless authorized in writing by Park Tool