T1 clamp is developed for 8mm scopes with following specs:

• The rear thread size of the T1 clamp: 46mm (male)

• Largest diameter: 53mm

• Thickness: 8mm

• Weight: 1oz

It supports most of 8mm scopes:

• ISCO S8 2x

• Iscomorphot 1.5x

• Bolex 8/19 1.5x

• Baby Hypergonar 1.75x

• Yahsica Scope 1.5x

• CANON 8 2x

• Kowa 8mm 2x

• Sankyoscope

• Elmoscope 8mm

• Panavision 8mm

• Delft vistascope 8mm

• Proskar 8mm

T1 clamp package includes:

• T1 inner ring

• T1 external ring

• Step down ring to connect to the anamorphic lens

You can also check HERE to see clamp package based on choice of anamorphic lens: