Strain Relief Round Cord Retainer Bushing (2 Pieces)(MP1043). These power cord keeper bushings are the easy low cost way to insulate and protect your round power cords. Provide non-slip grip and will not injure the insulation of ac cord, Material: NYLON 66 ,UL94V-2. The Double-D hole size that this mounts into is 15.9mm x 14mm and material mounting thickness of 1.90mm x 2.5mm. For every quantity of 1 added to your cart you will receive 2 bushings.