Constructed of corrosion resistant formed 304 stainless steel with UV resistant injection molded nylon mounting pads and knob. These Hatch Adjusters feature a simple twist knob to lock into position. Great for dock box lids, hatches, windshields, etc.A11-15/16″ B17-7/8″ C1-3/8″ UPC35514321150MPN321295-1LNS Part #354-3212951KMS Part #SDG 3212951DMP Part #02-5369