The ProSource door closer has an aluminum casted body with steel arm to resist corrosion. It's steel rack and pinion is heat treated for smooth action and minimum wear. The closer is lubricated with stable hydraulic fluid for multi-climate operation. It has an adjustable back check, fits left handed or right handed installations, does not have hold-open feature and the power size is 1-4. This product is ADA compliant and it comes boxed.