An assortment of hex washer-head self-drilling screws from The Hillman Group. Self-drilling screws possess a drill point enabling it to easily drill into material such as thin-gauge steel, wood, and fiberglass. No pilot holes required. Variants included in this assortment come in #6-20 & #8-18 coarse thread sizes and range from 1/2" to 2" in length. Full assortments of #46150 contain ten (10) refills comprised of Hillman item numbers #2657 - #2659, #46151 - #46155, #408019, and #408020.