These are suitable for Underwater/Marine use?

These extension arms can be used under sea water. First of all, this product is underwater shooting supplies. Secondly, this ball extension arm is made of aluminum alloy, which has excellent corrosion resistance.

Will the small balls at the ends slip?

Having never have slip while using them as long as you remembered to tighten the clamp. The friction from the silicone ring and the clamps, which can be adjusted to obtain by adjusting the clamp locking.

An extension arm has two length sizes, how should I choose?

From this end of the ball to the other end of the ball is the overall length of the extension arm, but according to the actual size of the product that can be used, it should start from the red silicone O-ring.

Package Dimensions L x W x H	24.3 x 6.3 x 3.1 centimetres
Package Weight	0.19 Kilograms
Product Dimensions L x W x H	25 x 25 x 229 millimetres
Item Weight	191 g
Brand	MINIFOCUS
Colour	2 x 20.3 Double Ball Extension Arm
Included components	8'' Ball Arm with 2 1” ball head
Part number	MF08
Size	8" Extension Arm
Water Resistance Level	Waterproof
Guaranteed software updates until	unknown

MINIFOCUS 8" Double Ball Aluminum Extension Arm, 1" Ball Head Connector Underwater CNC Arm System Ball Head Extension for Strobe/Video Light/Diving Camera Tray, Waterproof and Rustproof (2pack)

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