Kelliher has also used two custom Yamaha SBGs and a First Act custom 9-string Silverburst DC Lola, which was used particularly on the title track for Crack the Skye. In 2013, Kelliher got a signature Gibson Explorer, named "The Golden Axe".
Kelliher uses several guitars in Mastodon: his main guitar for a long time was a Gibson Les Paul Custom in a Silverburst finish. He used other Les Paul Customs in Ebony and Alpine White during the band's 2009 tour with Dethklok.