The holding arm creates a great deal of trust in advance simply due to its heavy weight. K&F Concept has a lot of advance bonus here because I use so many excellent products. This arm is made of full metal, except for the locking screws. The production and complete material appearance are of very high quality. The matt or semi-matt surface is very scratch-resistant and excellently finished. The mounting and hinge plates are made of 2 millimetres thick, solid metal. The pipes are real pipes and not just curved sheets. The clamps are made of die-cast metal. The plastic guide and clamp on the main joint still has slight plastic burrs. Even if only slightly, this applies to the locking screws. This is no problem, is easy to fix by yourself and does not affect the functions. Mounting material, as well as a spigot universal adapter with 1/4" and 3/8" threads, are included. The adapter can be attached to 3 sides of the front clamp. In addition, the front tube can be rotated before clamping, so that the accessories can be placed in almost any position thanks to 360° rotation. The pipes are not damaged or scratched when fixed by the locking screws. Very good The load capacity of 3 kg to 10 kg varies with the length within 51 ~ 100 cm. To do this, the locking screw should be tightened very firmly. However, this is easily possible thanks to the large, sturdy hand screw. The screw on the joint for the triangle bracket moves slightly when the arm is swung in and out, as there is too much play here. No problem for occasional use. Not beneficial in long-term or continuous operation. M5 screws plus nuts are installed. I wanted to replace this with M6, as the hexagonal nut holder in the joint also looks relatively large. Unfortunately everything doesn't fit because M6 is too big. After I tightened most of the screws, everything was better and is certainly also very durable. Despite minor weaknesses on my arm, all in all very good.