Park tool 1707.2 work tray collar The 1707.2 easily adapts the #106 Work Tray to fit the 41mm upright tube on 2011 and older PRS-20 and PRS-21 Repair Stands, as well as 1996 and newer PCS-1, PCS-4, PCS-4-1 and PCS-4-2 Repair Stands. Features Quick release clamp for easy adjustability Manufacturer's Part No: 1707.2 UPC: 763477014702 | Park Tool 1707.2 Work Tray Collar 1707.2 Tool Collar, Fits Prs-20/Prs-21