This review is for the K&F CONCEPT 2-Pack 9.8" Magic Arm, 1/4" Screw Camera Mount Arm 360° Ball Heads.

Again K&F produces an accessory with absolutely sound design with perfect fit and finish.

These adjustable arms are all CNC-machined stainless steel and aluminum with no structural plastic parts. The only non-metal that I see is where it is necessary, and that is in the non-slip resilient pads on each of the knurled locking nuts.

The single orange-anodized aluminum knob locks both of the end ball joints and the center knuckle joint at one time. Hidden rods inside of the arms apply pressure to the swiveling ball joints at the ends to lock them when you tighten the knob. You simply position the end accessory where and at whatever angle you want it and then tighten the knob, and everything locks all at once. The center knuckle joint even has interlocking radial grooves in each face of the mating parts to prevent any chance of slippage.

When locked these are the most rigid arms of this type that I have encountered. They are not particularly light at 216 grams (nearly 8 ounces) each, but this is no doubt due to the use of stainless steel where it is necessary to maintain absolute rigidity. Weight may be a consideration for you if you intend to use multiple arms on a handheld rig, for example.

I just love these third party manufacturers that come up with such well-executed designs for affordable prices. $35 for a pair of these is an absolute bargain that I highly recommend.