RTK-330 / 330T
Dimensions: 146(W) x 129(H) x 238(D) mm
(5.74" x 5.07" x 9.37")
Drivebays: For 3 x 3.5 (low profile)

RTK-430/430T
Dimensions: 146(W) x 129(H) x 238(D) mm (5.74" x 5.07" x 9.37")
Drivebays: For 4 x 3.5" (Low Profile)

RTK-431
Dimensions: 146(W) x 129(H) x 238(D)mm
(5.74" x 5.07" x 9.37")
Drivebays: Holds 4x 3.5" hard drive trays for SCSI Ultra 320, SATA, and PATA in a 3x 5.25" drive height.

RTK-440 / 440T
Dimensions: 146(W) x 171(H) x 238(D) mm (5.74" x 6.73" x 9.37")
Drivebays: For 4 x 3.5 (Low Profile)

RTK-540 / 540T
Dimensions: 146(W) x 171(H) x 238(D) mm (5.74" x 6.73" x 9.37")
Drivebays: For 5 x 3.5" (Low Profile)

RTK-541
Dimensions: 146(W) x 171(H) x 238(D) mm
(5.74" x 6.73" x 9.37")
Drivebays: Holds 5x 3.5" hard drive trays for SCSI Ultra 320, SATA, and PATA in a 4x 5.25" drive height.