7pce Wood Countersink Drill Set. Sizes: 3, 3.5, 4, 4.5, 5, 5.5 & 6mm with hex key. Drill & countersink in one easy step. Ideal to use with drills & drill presses. Adjustable drill depth stop to assure no over-drilling. Suitable for hard & soft woods, laminated board, plastic & plywood