This is a bg, HEAVY slide. They are thicker than the smaller foils so be aware that you have to take this into account. I wish there were lighter ones in the 36" full extensions, but at least you don't have to worry about overloading them. I will also point out that you cannot use regular lead screws when installing as they will rub. So you'll need to use a #10 screw so the cone head sits flush but doesn't go right through the hole.