Dimarzio 1 Meg Ohm EP1202 TONE POT fits Ibanez Jem RG S - as used by Steve Vai
Easily the best available. Ibanezking/Cottam Guitars - are a Fully Authorised UK Dimarzio Dealer. These pots would commonly be referred to as "short-shaft" pots and are ideal for scratchplate fitting or where the wood is quite thin - upto 7mm.