Final answer:
The wrench is unlike the other items as it is a tool used for gripping and turning, whereas the file, grinder, and oilstone are used for sharpening or abrading surfaces.
Step-by-step explanation:
The item that is not like the others in the list consisting of a file, wrench, grinder, and oilstone is b) Wrench. A file, grinder, and oilstone are all tools used for sharpening or abrading surfaces. A file is a handheld tool used to remove fine amounts of material from a workpiece. A grinder is a power tool or machine used for grinding, which is a process of using an abrasive wheel to cut, grind, or finish a material. An oilstone is a stone, often lubricated with oil, for sharpening cutting tools. In contrast, a wrench is a tool used for gripping and turning objects such as nuts and bolts, which makes it distinct from the other tools listed which are related to abrasive processes.