Apeks WTX Backplate - Aluminum Aqualung #388028 The backbone of any system - this cleverly designed back plate can be used with the webbed harness or inserted into the WTX Harness. Offered in either 304 stainless steel or 6061 anodized aluminum alloy. The stainless steel weighs approx 5 lbs (2.2 kg). The aluminum weighs approx 1 lb 11oz (753g) 4 each upper and lower slots accommodate nylon cylinder bands so a single cylinder can be strapped directly to the plate. Having a series of 4 slots provides lateral stability of the cylinder that traditional 2 slot plates cannot. 3 holes at the top of the plate offer a range of height adjustments for the buoyancy cells and the cylinders. In addition, a corresponding lower center slot allows for lower band bolts that are misaligned. 2” wide crotch strap slot. Upper and lower perimeter holes along either side and holes along the bottom allow for the mounting of accessories. Both offer an electro-plate finish and a laser-etched Apeks logo to enhance the look of the plate.