The Thresher

The Tresher +2 is an unique magical flail with a +2 bonus to THAC0, 1d6+3 damage and a speed factor of 5 and it has a weight of 13 lbs. This item appears in Baldur's Gate: Enhanced Edition, it can be purchased at the Sorcerous Sundries by Halbazzer Drin.

In-game description
"With one rod of steel and another of bronze, this double-headed flail metes out punishment right and left. The weapon's carved wooden haft depicts scenes of battle in which champions of Helm, each wielding an identical flail, wade through a field of orcs, threshing them like so much wheat."