Park Tool Micro-Adjust Repair Stand Clamps. Features: Cam-actuated adjustment system for quick entry, adjustment and exit Fully adjustable clamping pressure prevents damage to thin-walled tubes Grip nearly any tube from 7/8" to 3" (23-76mm), including aero tubes Narrow clamping jaws (2.7" / 7cm) fit into tight areas or on short seat posts Soft, durable composite rubber jaw covers Specs: Description: micro-adjust repair stand clamp, 100-3D Remarks: Fits PRS-2, PRS-3, PRS-4, PRS-2 OS, PRS-3 OS, PRS-4 OS and PRS-4W