Old English tol "instrument, implement used by a craftsman or laborer, weapon," from Proto-Germanic *tōwalan "implement" (source also of Old Norse tol), from a verb stem represented by Old English tawian "prepare" (see taw). The ending is the instrumental suffix -el (1). Figurative sense of "person used by another for his own ends" is recorded from 1660s. Slang meaning "penis" first recorded 1550s.
kit n.1
late 13c., "round wooden tub," perhaps from Middle Dutch kitte "jug, tankard, wooden container," a word of unknown origin. Meaning "collection of personal effects," especially for traveling (originally in reference to a soldier), is from 1785, a transfer of sense from the chest to the articles in it; that of "outfit of tools for a workman" is from 1851. Of drum sets, by 1929. Meaning "article to be assembled by the buyer" is from 1930s. The soldier's stout kit-bag is from 1898.