A roll line assembly for supporting and transporting hot material in a continuous caster, comprising a first assembly unit and a second assembly unit; the first assembly unit comprising: a rotatable first shaft defining a first longitudinal axis and having a first end region spaced apart from a second end region along the first longitudinal axis, a first roll mantle enclosing the rotatable first shaft around a circumferential direction, the first roll mantle having a first outer surface for supporting and transporting hot material and a first inner surface being operatively connected to the rotatable first shaft, and a first bearing and a second bearing for allowing rotation of the first roll mantel and the rotatable first shaft about the first longitudinal axis, wherein the first bearing is arranged on the first end region and the second bearing is arranged on the second end region; and the second assembly unit comprising: a rotatable second shaft defining a second longitudinal axis (A'), and having a first end region spaced apart from a second end region along the second longitudinal direction (A'), a second roll mantle enclosing the rotatable second shaft around the circumferential direction, the second roll mantle having a second outer surface for supporting and transporting hot material and a second inner surface being operatively connected to the rotatable second shaft, and a first bearing and a second bearing for allowing rotation of the second roll mantel and the rotatable second shaft about the second longitudinal axis(A'), wherein the first bearing is arranged on the first end region and the second bearing is arranged on the second end region; wherein the rotatable first shaft is configured to be releasably connected to the rotatable second shaft such that the rotatable first shaft and the rotatable second shaft can be maintained in longitudinal axial alignment during rotation of the roll line assembly, whereby the first assembly unit is operatively engaged with the second assembly unit. a rotatable first shaft defining a first longitudinal axis and having a first end region spaced apart from a second end region along the first longitudinal axis, a first roll mantle enclosing the rotatable first shaft around a circumferential direction, the first roll mantle having a first outer surface for supporting and transporting hot material and a first inner surface being operatively connected to the rotatable first shaft, and a first bearing and a second bearing for allowing rotation of the first roll mantel and the rotatable first shaft about the first longitudinal axis, wherein the first bearing is arranged on the first end region and the second bearing is arranged on the second end region; and a rotatable second shaft defining a second longitudinal axis (A'), and having a first end region spaced apart from a second end region along the second longitudinal direction (A'), a second roll mantle enclosing the rotatable second shaft around the circumferential direction, the second roll mantle having a second outer surface for supporting and transporting hot material and a second inner surface being operatively connected to the rotatable second shaft, and a first bearing and a second bearing for allowing rotation of the second roll mantel and the rotatable second shaft about the second longitudinal axis(A'), wherein the first bearing is arranged on the first end region and the second bearing is arranged on the second end region;