S200 Stainless Steel 12.5mm Bolt Handle, this is made of Tough Stainless Steel so is less likely to break, as can happen with the Plastic or Aluminium one. The plastic one is smaller and has a very poor feel as it gives a bit.
If you have the Plastic one then you will have to buy the pellet probe as well, to match the design. As it will not fit directly on the plastic bolt, as the bolt has a larger male thread. The older one have a female thread and screw.
Please note:
This is not for the very latest model, this is for the S200s that have an Allen bolt fixing through the centre of the rear bolt cap.

First Photo shows my larger Reprofiled Bolt handle and SSteel probe, Bolt and Rear cap.

Bolt probe in .177 or .22 is also be available if required under the options tab,