A tool mounting assembly comprising a shank holder having an elongated passage and an elongated tool shank for an earth working or agricultural tool which is received within the passage and which includes a series of longitudinally spaced teeth. A rotatable adjuster is mounted on the shank holder and can cooperate with the teeth for moving the shank longitudinally of the passage to vary the operating depth of the tool. The shank can also cooperate with the adjuster to lock the adjuster against rotation which prevents longitudinal movement of the shank. A retaining member can be located in the passage for cooperation with the shank to hold the shank in this position. The adjuster may also be rotated to a position out of engagement with the shank teeth which allows for longitudinal sliding movement of the shank through the passage.
