Options: Variations: 00M7520 - 1 1/2" Sure-Grip, Female, each 1 - $2.50 5 - $2.10 5/16-18 Thread Female Sure-Grip Knob Made from durable plastic, this sure-grip knob in a female configuration can be combined with any of our 5/16-18 nuts, threaded inserts or machine bolts.