1-PIECE HARNESS SYSTEM - OMS® ’s superior deburring process eliminates back plate sharp edges and prevents abrasion to webbing and BC’s and most importantly cuts. All harness systems can be utilized with single or double cylinder systems. The OMS ® back plate is available in Aluminum (2 lb.) or Stainless Steel (6 lb.), incorporates additional slots to mount cam bands for Single cylinder configuration , slots to mount either a 1" or 2" crotch strap and a lower center slot to facilitate mounting on band bolts that are slightly misaligned