Two-piece telescopic boom arm with 3/8" thread. Complete with locking washer and plastic grip. Smooth, silent and scratch-free adjustment thanks to large wing nut. 
 
Specs – 

Boom arm:	2-piece telescopic design
Boom arm length:	from 425 to 725 mm
Clamping:	wing nut
Material:	steel
Threaded connector:	3/8"
Type:	black
Weight:	0.58 kg
Boom arm:	2-piece telescopic design
Boom arm length:	from 425 to 725 mm
Clamping:	wing nut
Material:	steel
Threaded connector:	3/8"
Type:	black