A C Spanner is a spanner that’s shaped like a sickle. This spanner has a projection that’s located on the end of its curve. You can use this to help you turn large narrow nuts as long as they have an indentation on them. This indentation is important because this is where the spanner’s projection fits into so that it doesn’t slide around while you’re trying to tighten the nut.
These spanners are a high-quality hand tool. They’ve been designed to help you with the loosening of retaining rings and the adjusting of chains. Therefore these spanners incorporate steel roll pins into them. These pins will allow the jaws to adjust to the correct size of suspension fastness.
To determine how big your spanner is you’ll want to use a vernier caliper to measure the outside of its collar width.