1. An article holder for securement about an elongated member, said holder comprising a one piece body of shape retentive, deformable and elastic material and including article support means for supporting an article therefrom, said body further including spaced generally parallel integral leg portions of panel-like configuration projecting endwise outward from one side thereof, the free end of one of said leg portions including an integral endwise outwardly projecting stem whose free outer end terminates in an integral eye portion and the free end of the other leg portion including a similar integral endwise outwardly projecting stem whose outer end terminates in an integral crosshead removably insertable through said eye portion, the portion of the side of said body outwardly from which said leg portions project being contoured to define a semi-cylindrical pocket opening laterally outwardly between said leg portions, said leg portions being disposed in planes paralleling the center axis of said semi-cylindrical pocket, said pocket defining an abutment surface against which one side of a cylindrical structural member may be abutted, the effective length of said leg portionS and their stems being such, when said leg portions and stems are slightly elongated and bowed, to allow the stems to be secured together by insertion of said crosshead through said eye portion and to define, together with said pocket, a cylindrical area therebetween of substantially the same radius of curvature as the radius of curvature of said pocket, said body having a bore formed therein opening outwardly through another side of the body, said bore being of a diameter adapted to wedgingly receive the threaded base of a spark plug therein.