In 1974 Craig Gruber got his hands on a 1963 Gibson Thunderbird bass. Due to the dissatisfaction with the limited number sounds of the Thunderbird Craig began to try his hand at modifications. In 1975 Craig supercharged the 63' Thunderbird by routing out, and installing a Fender jazz pickup by the bridge. Additionally he added two hi-A pickups wired in stereo and a bass boost overdrive circuit! Craig then ran each pickup to it's own individual Marshall stack, rivaling or surpassing John Paul Jones of Led Zeppelin, as well Jack Bruce's setup.

In 2006 Craig was contacted by a Luthier that had previously built Craig a custom bass when he was working with Ronnie James Dio and Black Sabbath on the Heaven and Hell album. After years of shredding legions of bass guitars, Craig was tired of settling for anything less then the best and decided to utilize his thirty years of experience. Infinite Metal Werkz was founded by Craig Gruber with the intentions of bringing new and innovative designs that encompass proper weight, balance, comfort, structure, appearance, superior electronics, incredible workmanship, with a flawless finish, capable of a myriad of tones.

Craig Gruber's career resume and accomplishments include working and recording with Elf, Ronnie James Dio, Ritchie Blackmore's Rainbow, Black Sabbath, Gary Moore, The Rods, and his own solo career with Bible Black.

When Rock's legendary bassist's get together to discuss their craft the name "Craig Gruber" is sure to arise. Legions of bassist's worldwide have all praised the sinewy burning bass lines that have made craig's signature style so identifiable. From the early Elf albums with Ronnie James Dio through the Rainbow era, onto the Gary Moore saga and his stint with Black Sabbath during the Heaven and Hell sessions, Craig has always been admired for his 4-string excursions. Some of the world's greatest guitarists including Ritchie Blackmore, Gary Moore and Tony Iommi have all praised Craig's thunderous talents. Creamproducer/Bassist extraordinaire Felix Pappalardi worked with Craig on his Solo album "Bible Black". "Working with Felix was an honor" says Craig. "He really understood the concept of a burning melodic bass line that is locked in tight with the drums and anchored foundation deep into the track!" Felix was and still is one of Craig's greatest inspirations. After all, 20 million Cream albums can't be wrong. LONG LIVE JACK BRUCE! Craig has been has been writing, producing and touring and recently he has started his own custom built bass guitar company.Infinite Metal Werkz. Listen to Craig Gruber in a Rock94 radio broadcast

If any of you hardcore bassist's out there are interested in one of my basses, I will make one just for you and personalize it inside the cavity cover plate with a handwritten message from me to you, dated and signed "Craig Gruber".

Craig Gruber