These wheels are specifically designed to fit a Hawke Sidewinder 30 and are unsuitable for other scopes.
The wheel is 75mm in diameter which is just right to use on a BSA R10 with medium scope mounts.
The diameter of the cog is 60mm.
The radius of the lever (centre to tip) is 37.5mm
Supplied with 1 silver stainless bolt. Black bolts are available here: https://smwengineering.co.uk/products/stainless-black-bolt-upgrade-m3-12mm
Default colour is black but other colours available by request.