1/4-20 Int. Thd., .512 Lg., Flushed, E-Z Lok Hex Drive Knife Thread Inserts for Wood (1 Each) Provides a Strong Machine Thread In Soft Woods Ideal For Use in Pine, Plywood, Composition Board, and MDF Designed For Use In Applications Such As Ready-To-Assemble Furniture, Drawer Pulls, Display Case, and Shipping Crates Simply Drill the Appropriately Sized Hole and Install with Hex Key or Optional Drive Tool