Main Page | See live article | Alphabetical index A wrench or spanner is a tool used to turn bolts or other hard-to-turn items. There are many types of wrench, including the: open-ended spanner: a one-piece spanner that grips two opposite faces of the nut adjustable spanner/wrench: an open-ended spanner/wrench with adjustable (usually smooth) jaws monkey wrench: adjustable wrench with serrated jaws (depicted above right) ring spanner: a one-piece spanner that encloses the nut on all sides combination spanner: a double-ended tool with an open-ended spanner at one end and a ring spanner at the other spoke wrench Allen wrench hand wrench pipe wrench strap or chain wrench: a self-tightening strap or chain attached to a handle, used to grip and turn smooth cylindrical objects oil-filter wrench: a type of chain wrench for removing cylindrical oil filters socket spanner/wrench: a hollow cylinder that fits over one end of a nut box spanner: a tube with a socket formed at one end, that can reach a nut at the bottom of a hole or in a restricted space This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.