Rather than teeth, these wrenches use a series of rollers to engage the ratchet, enabling work in the tightest of spaces. Also known as silent ratchets, they don't make the traditional clicking sound when turned. The smaller the turn required to ratchet, the less clearance you need to engage the ratchet.

Wrenches with one head can ratchet in both directions, but you’ll need to remove the square drive with pliers and insert it on the opposite side of the head. The square drive is held in place with a retaining ring.

Wrenches with two heads ratchet in both directions—simply flip them around to switch between clockwise and counterclockwise rotation.