Primary Arms does not disclose this information. They do state that the rings and screws are constructed of high quality aluminum with a matte black anodized finish, these rings also feature a lifetime warranty.
There's not enough information to give an exact answer, without knowing the type of 10/22 firearms you're trying to equip a scope. Furthermore, Primary Arms offers two scopes w/ the ACSS 22LR: 1-6x24SFP LPVO & 6x32 Fixed.
The eye lens diameter on the 1-6x24 is larger than the objective lens at 33.2mm, rounding up the length of the diameter is 11mm.
The objective lens on the 6x32 is the largest lens at 32mm = 10mm.
So you'll need a scope mount that at minimum clears either of these distances.
The measurement is base to center height.
Your going to need MPN: 910064
MPN: 910072 should be the appropriate height.
MPN: 910072 should be the appropriate height.
Of these options MPN: 910072 would be the recommended rings for your setup.
Please contact us at techsales@opticsplanet.com with the make, model, and caliber of your rifle so we can confirm proper fit.