By Huu Khanh Nguyen · Updated October 29, 2026 · speed-rail, tube-fitting, flange, slotted-flange
A cast oblong base plate with a slot at each end and a socket in the middle, so an upright can be set a little either way when it is bolted down.
| Name | Default | Unit |
|---|---|---|
| Tube outside diameter | 48.3 | mm |
| Socket bore | [49, 43].at([48.3, 42.4].indexOf(tubeDiameter)) | mm |
| Finish | white |