This unique product offers all of the traditional features of ordinary files plus the flexibility you often need. Plastone flexible files are made of hard abrasive materials pressed into a flexible core. This enables you to bend or twist these tools any way you like to reach curved surfaces and otherwise hard-to-reach areas. - Many other uses can be found for these inexpensive files, wherever fine finishing of metals is required. They are impervious to oil and water, accumulations of grease can be washed from them with cleaning solvents or soap and water.