Abstract: A reversible wrench with a selector which may be shifted to determine the directions in which the wrench will drive and slip. A polygonal opening is located in the wrench. A socket driver is located in this opening with a roller for each polygonal intersection point located between the polygonal opening and the driver. A pair of energizer springs are located between each contiguous pair of rollers and a separator affixed to the selector is located between each pair of springs.

Abstract: A fireplace heat exchanger surrounding the fire with two upper cross members to the rear of the fire extending horizontally back and forth between two U-shaped side sections. Baffles direct the air back and forth through the two cross members between the two U-shaped side sections. The heated air is circulated through the heating system either by natural circulation or by forced draft.