The Driller and the Rooter are a matched pair: a couple of long, flexible dongs fitted with ridges along their shafts to which their names refer tellingly. They have all the length any human orifice can accommodate - about a forearm's worth - and, as I discovered, each has distinctive features which help one keep hold of them when one is good and lubed.
Impressive though the Driller and Rooter may be, however, in my opinion neither can hold a candle to the Sledgehammer.
The Sledgehammer is quasi-realistic, with triple helpings in the girth department. Reasonably long as well - about 9 inches, I'd say - ol' Sledge is best kept in the back of Madame's drawer, to be brought out on those well-spaced evenings when she's in the mood for a serious dose of dumb, brutish size.