Matl cres, mil-s-5059, type 302, or cres, mil-s-854, type 410, or cres, mil-s-6721, type 321a, or cres, mil-s-5059, type 316; 0.537 in. Min lg; 0.559 in. Max lg; 0.123 in. Min w; 0.128 in. Max w; 0.105 in. Min thk; 0.115 in. Max thk; two 0.069 in. Min diameter 0.073 in. Max diameter holes through irregularly spaced along lg