Heil Sound WM-1 Vertical Surface Mount for Heil Booms WM-1 Vertical Surface Mount for Heil Booms Use the Heil WM-1 vertical surface mount to attach your Heil booms to a vertical surfaces Brass insert insures smooth perfect fit Use the Heil WM-1 vertical surface mount to attach your Heil booms to a vertical surfaces Brass insert insures smooth perfect fit