By 1937 the range of Atlas drills and their accessories had reached its most comprehensive. While the original, low-cost plain and simpler ball-bearings models remained in production, a new model, the improved Model 52 for bench mounting - together with an equivalent floor model, the 72 - was introduced. These two drills had their table surfaces ground finished, were equipped with a more rugged head casting - braced  where it wrapped around a heavier column - together with a front 4-step V-pulley running in what was described as a new design of double-row ball race that could better resist the effects of belt pull.