The Research Machines 380Z was an early British microcomputer, released in 1977. Unlike many other early microcomputers, the design was industrial style, a hefty metal box, sometimes described as 'built like a tank'; a good description can be found here: https://www.pinterest.co.uk/pin/658229301760799838/
It is said to be rack mountable, though the width has been given at 59.5 cm, which is 23.4 inches; I thought a standard equipment rack was 19 inches wide?
One thing I have not been able to find is a figure for the weight of the machine. I imagine it must've been quite substantial, and not necessarily easy to carry with those thin handles.
How much did it weigh?