Leupold Alumina Flip-Back Lens Cover - 44mm Compatible with 44mm scopes by Leupold Designed for VX-5HD, VX-6, VX-6HD and Mark 5HD riflescopes The round objective and ocular models can be rotated so they can open in any direction Many Leupold scopes built prior to 2004 can be threaded to accept Alumina accessories