This is a modern replacement (plastic) float for the Amal TT (and Type 27) carburettor, using the Type 14 and twin bowl float-chamber float.
As you can see from the packaging, it icomes complete wtih floatchamber clip. Please note though - original floats were of copper with a spring clip at the top, while these modern replacement type are plastic and the needle clip fits into a slot at the top of the float. There were two types of needle widely used - which I show in the two accompanying photos: On the right is an Amal RN employing twin floatchambers. The float needle has a 1/4" diameter base taper (as shown by the caliper). For this type of needle the float can be used as it is. However - for most TT type floatchambers, the needle base taper is 5/16" diameter, as per the TT floatchamber and needle on the left in the photograph. For this type of needle, you will need to make another groove 0.240" lower than the original (1/4" is close enough!), so the plastic float clips lower - to take into account that original float clips sat higher in relation to the float itself. Email if you require further information to clarify