An assortment of clamping knobs from Hillman. These knobs are ideal for moderate-to-heavy torque applications. They are best used wherever a quick hand adjustment is needed. The small clamping knobs included in this assortment range in diameter from 1/2" thru 1" and are constructed of high-quality materials which offer a high resistance to corrosion. Full assortments of #55381 contain twelve (12) refills comprised of Hillman item numbers #55382 - #55393.