With an adjustable sliding guide in the magazine, the GREX CF15AA corrugated nailer easily accommodates three different corrugated fastener lengths - 1/4", 3/8" and 1/2". The heavy duty corrugated 1" crown is appropriate for many types of joints such as butt joints, T-joints, and miter joints. Engineered with longevity, serviceability and all day continuous use in mind, the CF15AA has a lightweight aluminum body, which supports high endurance and all day continuous use. Promoting long life, the internal piston, cylinder and firing valve are built from precision machined aluminum. Your GREX is engineered and designed for years of continuous use and years of maintenance and technical support.