Graetz Mfg., Inc. is a low-cost American producer of sprockets, shafts, gears, hubs, agricultural chains and other miscellaneous products for a wide variety of industries. For over 70 years we have produced a multitude of products used by companies such as Kuhn North America, HS Kelly Ryan, Sioux Automation and Meyer Mfg. A combination of aggressive pricing, short lead-times and outstanding quality makes Graetz Mfg., Inc's products the best value on the market. As the original designer and manufacturer of the Hook Eye Barn Cleaner Chain Systems, we know the product inside and out. Originally patented by Edward Graetz in 1941, we manufacture and sell complete units and all components for the 400 Series Barn Cleaner System. Experience first-hand Graetz Mfg., Inc's commitment to customer service along with the superior quality of our products. Thank you for your consideration. We look forward to receiving your inquiries.Please visit our web site at www.graetzmfg.com. Sincerely, Jamie Graetz President Graetz Mfg., Inc. Proudly Made in the USA!