I had just bought a new window AC and had also bought this air conditioning support bracket to go with it. The support bracket took 15 minutes to install and required no tools. The bracket came with all the hardware needed to install, an Allen Wrench to tighten the screws and easy to read instructions.
The adjustable support bracket is made of heavy duty metal, while the two feet of the support legs have rubber padding which are designed to protect the walls. Overall, I have no issues with this AC support bracket, it is secure and it is able to easily support the weight of my 50 plus pound window air conditioner.