McMaster 2936T72 Galvanized Steel U Bolt, with Mounting Plate, 1 4" 20 Thread Size, 1 1 2" ID G3422115 Also known as collar nuts Also known as collar nuts 12 gal For Use With Medium Emergency Spills Vapor Suppressant Included No Solidifier Included No Pad Material Polyproylene Product Weight 24 lb Container Color Yellow Emergency Response Handbook Instructions Included Emergency Response Handbook Included Granular Sorbent Included No Includes Mounting Fasteners No For Use With Chemical or Metal Type Universal Fluids Absorbed Socks Universal Epoxy Putty Included No Number of Pads Included 15 Neutralizer Included No Pillow Sock Outside Skin Material Polypropylene Fluids Absorbed Pads Universal Number of Pillows Included 2 Galvanized Steel — Galvanized steel U bolts have better corrosion resistance than black oxide and zinc plated steel U bolts U bolts support heavy pipe