XS Scuba Highland Stainless Steel Backplate is made from 316 stainless steel and features 'V' depth of 1" for flatter fit, cam band slots for single tank diving without the need for a single tank adapter, both angled and horizontal slots for "straight" or "crossover" shoulder strap configuration, twin mounting holes on 11" centers (bottom holes are slotted for easier mounting) and 3/8" accessory mounting holes along both sides. Weight is 6 lbs.