● Shock Cartridge Tool （Kyosho Lazer ZX-5 FS2＆UltimaRB-5&6） ● Feature for Kyosho ZX-5 and RB-5&6 1/10 scale EP buggies.Made to properly fasten the lower cartridge cap on standard and big bore shocks the tool also helps to unscrew rotted caps after a long time of use.