Specification:

These friction arms come with a large center locking knob to lock all 3 movements,  and variable friction and locking is obtained by adjusting the knob.

The rod clamp also have 3/8" female hole for professional use....

Max. Load: approx. 2kg

Attachment: 1/4" male and  15mm rod clamp with 1/4" and 3/8" female hole

Material: Aluminum/Steel

Length (Max.): approx. 17cm