Robust base for and be able to hold a round tube or mast with the base of 55/60mm

Aluminium base 400x400x15mm

Mast clamping by machined part with two Metric 8 pins attached to the base with 4 M6 stainless screws.

Height of the machined part where the tube enters: 150 mm.
External diameter of the round piece: 80mm.
Internal Diameter: 60mm.