Review on 🔧 Highly Versatile OTC 4791 Spanner Wrench: Optimize Your Search by Tim Wadman

I bought this wrench based on a review saying it would fit a collet nut on a 5C collet. With 10 seconds (literally) on a belt sander to round the outside edges of the pin, this wrench fits perfectly; just like the previous reviewer said it would. 5C collet block sets are sold with blocks and collet nuts, but do not come with a nut wrench. The nut is 42 mm in diameter or approximately 1.6535 inches. I used a Knipex water pump wrench to tighten the nut. But even with very careful work, the notches on the nut were flattened. Now that I have this wrench, I don't have to tighten the nut anymore. The quality is good and the price is right. If you have a set of 5C collet blocks for milling then you need this key. Diameter. I'm not sure if this wrench will work with much larger diameter tools, but it's perfect for a 1.6535 inch (42mm) diameter nut.