This is the OMS Twin Tank BD3080-K Mounting Installation Band Kit Set Features: 3.0 width designed for tall and heavy cylinders Cylinder O.D.&';s: 8.00" Manifold Center to Center Distance: 215 mm +/- .75 Rod Length: 5/16"-18 x 6.5" L Band edges are rolled (edge relieved) to prevent paint gouging and scratching during assembly Threaded rods, nuts and washers are supplied with each band kit so that you can use a single or multiple backplates (dedicated bolts do not allow you to do this) Due to a new inert gas welding technique OMS Bands are the strongest in the world! A 3rd party conducted a destructive pull test and the nearest high quality competitors bands failed at 7000 lbs. pull while OMS bands withstood 9500 lbs.! "