2 Pack Tomario Silicone Sink Bath Plug with Chain, 450mm Stainless Steel Ball Chain Hook for Kitchen Bath Sink Drain Stopper Plug (1 3/4 Inch, Drain Plug Size Between 42 to 45.5 mm)

We have a standard size plughole in the metal sink, and this replaced the broken chain and plug perfectly.Was attached in seconds to the existing mount point and didn't need any tools as it connected as you would a key to a keyring.

Update to my initial review below. The aftersales service is amazing. As soon as they saw my review they got in touch and offered me a refund. Very impressed so raised my score from 2 to 4 stars.This is a black rubber plug with a bit of metal cardboard stuck to the top!! It's hilarious. I'm keeping it as it still works but it very naff!

I tested this plug by leaving some water in my bath overnight, the water level was unchanged in the morning meaning it was a perfect fit and worked well. My partner now steals it to use for the kitchen sink, guess I'm going to have to buy another one!