The SeaLife Lens Caddy mounts SeaLife DC, Micro and RM-4K series lens to a camera or tray using the standard ΒΌ-20 tripod screw or to any grip/arm up to 1.8β (45mm) in diameter using a sturdy hook & loop nylon strap. The Lens Caddy holds any DC series lens, or Micro and RM-4K series lenses SL571 & SL572.