These are Sub Assembly Tube Lengths Ricoh Ri3000 Ri6000 Anajet mP5 mP10. These are small pieces of tubing that are used in many assemblies and fittings.
1 Inch - J0974261
1.5 Inch - J0974262
1.75 Inch - J0974270
2 Inch - J0974263
2.25 Inch - J0974264