By Huu Khanh Nguyen · Updated October 29, 2026 · kee-klamp, tube-fitting, cap, ball
A cast ball cap for the top of a railing post, with a flat underside that seats on the tube.
| Name | Default | Unit |
|---|---|---|
| Tube outside diameter | 42.4 | mm |
| Socket bore | [1.38, 1.72].at([33.7, 42.4].indexOf(tubeDiameter)) * 25.4 | mm |
| Finish | white |