There are two versions that have been released - V1 and V2. V1 was sold in the Zero Percent Starter Kit for the first few months after that product's release, before being replaced by V2. V2 is sold with the Optic Cut Kit and is required for the optic cut process.
If you have a set of Universal Clamps, you can determine whether they are V1 or V2 by checking the upper clamp jaw.
- V1 clamps have two M5 bolt holes and a shorter upper jaw
- V2 clamps have four M5 bolt holes and a longer upper jaw
If you have a set of Rev A clamps and would like to perform the optic cut, you will need to purchase a set of modern Rev B clamps. These can be found here.