Our aluminium grade (5083) 4040 t-slot plate has a smooth underside and can be easily suctioned on to a vacuum table.Making it easy to mount with vices, clamping towers, mounting angles and anything else you wish to clamp.Dimensions: 400 mm (15.748") x 400 mm (15.748")Profile height: 20 mm (0.78")H1 = 6.5 mmH2 = 8 mmD ..