Spanner Wrench Tool For SLR DSLR Large Format Camera Lens Repair Opening Retaining Ring Remover: Amazon.co.uk: Electronics & Photo
Neewer Camera Lens Openning Tool Kit Includes: 10-100mm Lens Set with 3 Tips, 6 Screws and 2 Hexagon Wrench for Canon Nikon Sony Olympus DSLR Camera: Amazon.co.uk: Electronics & Photo
Fotga Pro Spanner Wrench for Camera Lens Repair Opening Open Tool Stainless Steel¡: Amazon.co.uk: Electronics & Photo
Lens Spanners -- Using the right tool for the job - PentaxForums.com
Oumij1 Camera Repair Spanner Professional Spanner Wrench Repair Maintanance Tools for DSLR Camera Lens: Amazon.co.uk: DIY & Tools