Heat treated tool steel countersinks with a HSS drill. Adjustable for different length screws and can produce a 9.5mm (3/8 inch) diameter or 12.7 mm (1/2 inch diameter counterbored hole for woodplugs. The drill produces pilot holes only. Specifications • Shank Diameter: 1/4 hex • Pack Qty: 5 pack Contents: 1 x 2.0mm (5/64") drill countersink 1 x 2.5mm (3/32") drill countersink 1 x 2.75mm (7/64") drill countersink 1 x 3.25mm (1/8") drill countersink 1 x 3.5mm (9/64") drill countersink Contents • 1 x 2.0mm (5/64") drill countersink • 1 x 2.5mm (3/32") drill countersink • 1 x 2.75mm (7/64") drill countersink • 1 x 3.25mm (1/8") drill countersink • 1 x 3.5mm (9/64") drill countersink