Simple coilover adjument question

[Onefast99gsx]

I'm not sure what the brand is of the coil over(I just emailed the guy i bought it from to find out). The threaded part is an anodized red. The adjuster part is anodized gold. The Tokico Illuminas are White with red lettering. I'll have to check the spring color at lunch when i go home but they are definately Eibach. Says right on them.

What's a perch?

Thanks.