MaterialAluminumPurposeTo align BACW10EP (Rev/-) washers concentric with BACN11AV (Rev/E) and AW (Rev/C) nuts on BACB31AD (Rev/H), AE (Rev/D), AF (Rev/H) and AG (Rev/D) tapered sleeve bolts during installation on 787 wing to bodyOverall Length0.365Used WithBACN11AV, BACN11AW, BACW10EPFastener TypeSleeve Bolt WashersInstallation MethodAlignment 