Fits on the FC100DC tube cradle perfectly, and in turn fits in the Skywatcher mount, but not perfectly. The dovetail is a bit smaller than ones by other manufacturers, it is quite noticeable, it looks thinner somehow. In the EQ5 clamp the main screw holds it perfectly and it is very secure, if it wasn't i wouldn't use it, but because it is smaller the secondary screw isn't long enough to reach, so no belt and braces. It is useable, but I will be swapping it in the future.