400 Series C Clamp, Sliding Pin, 4 1 8 in Throat Depth ORS NASCO air circulating over the sweatband air circulating over the sweatband lowers the temperature inside the cap Frame is made of 1 inch angle aluminum to which a 2 inches wide x 1 4 inch thick strip of high grade flexible black squeegee rubber or neoprene is attached with cadmium plated screws Available with two different types of handle assemblies and curved or straight frames Numbers followed by TP or TPN are equipped with a tapered handle socket regular duty with extra deep throat Black oxide spindles and perma pad® resist corrosion and are replaceable Innovative frame geometry for maximum strength Drop forged steel frame