A Hillman assortment of clamping knobs with a threaded female insert. Clamping knobs provide a strong grip and secure control through the use of elements such as texturing, knurling, lobes, or wings. These knobs are ideal for applications that require quick hand adjustments. Included parts measure 1.75" in diameter. Full assortments of #52093 contain six (6) refills comprised of Hillman item numbers #397622 - #397627.