Micro-Tools sells different types of spanner wrenches and you can also find them offered on ebay. I have the type with interchangeable tips and IMO it's the only way to go....... a lifetime investment in a quality tool.
However, there are times when the less expensive fixed-tip type may be necessary as there are lens with collars in recesses that the type I have won't fit. The J-12 lens comes to mind. It has a collar that secures the front and back of the lens together and my spanner wrench won't work.
Walker