T & B bars incorporate Heavy Duty spring-loaded ball transfer units for accurate positioning & effortless conveying of tools & dies on press & machine beds. Once positioned, clamp the tool & the springs allow the ball units to retract beneath the bed. Unclamp & the ball units will raise the tool above the bed ready to convey again. T-Bars feature an integral locking mechanism. B-Bars are locked using recessed M8 cap screw (requires drilling & tapping of the bed). Custom sizes available.