The Zip-It anchor is a one piece self drilling anchor designed for use in hollow gypsum wal lboard for light duty loads. It is available in both engineered nylon and Zamac alloy for use with either a No. 6 or No. 8 screws in 3/8 in to 1 in wal lboard. The Zip-It Jr. is formed from engineered nylon for use with No. 6 screws in 3/8 in to 5/8 in wal lboard, Wall Thickness: 3/8 to 1 in, Material: Zinc. Rawplug® 02349Z-PWR Zip-It Anchor, 3/8 - 1 in, Zinc