On their page they say "dual"
https://butlerperformance.com/i-3123...3Fq%3DEDL-5845
Valve Springs, Hyd Roller, Dual, 1.460 in. O.D., 150 psi @ 1.800 inst. height, 1.150 in. Coil Bind Height
I was also surprised.. he said he does not do such "repairs" and ne need for these tools. Last time we had the heads off and changed the stock E-head springs to the Lunati with a tool that almost cracked under the pressure. I guess the Proform will be a lot better... I ordered this one:
https://www.summitracing.com/parts/pro-66784