The AC Brackets are available for most single or double hung windows from 26.5 to 42.5 inches wide and suitable for walls from 0.5 to 11 inches thick. No Drill Window AC Support Bracket is even suitable for walls <0.5" thick as long as the wall can support the weight of the air conditioner Air Conditioning Brackets works with all brand name air conditioners. No Drill Ac Support Bracket & pre-installed partial frame - The No Drill Ac Window Bracket eliminates drilling into your window sill completely and achieve an easy and clean no-drill installation.And for easy installation, we pre-installed some AC Bracket No Drill frames with detailed and straightforward installation instructions included in the package. Safe and Durable - Window Air Conditioner Bracket are made of high quality steel that can withstand over 220 pounds, while the epoxy powder coating extends the life and provides long-term protection of the Window AC Mounting Support Bracket Accessories. Sturdy and strong - The Window AC support structure ensure the AC Brackets for Windows stays in place on the window, Integrated Rubberized Feet Add Stability. It helps to relieve the pressure on the window air conditioner and protects the windowsills and walls of the house or the surface of the RV from damage.