a trimmer head for use with rotary vegetation cutting devices is disclosed . the head has a wear guide that indicates when the body of the trimmer head is worn down and needs replacement . in an embodiment of the invention , the body comprises two plates that are molded to fit together . the plates have bores for holding connecting pins . the connecting pins not only hold the plates together , but also pivotably support cutting blades , by fitting into openings in the blades .