Heat treated tool steel countersinks with a hss drill adjustable for different length screws and can produce a 95mm 38 inch diameter or 127 mm 12 inch diameter counterbored hole for woodplugs the drill produce pilot holes only whats included1 x 20mm 564 drill countersink1 x 25mm 332 drill countersink1 x 275mm 764 drill countersink1 x 325mm 18 drill countersink1 x 35mm 964 drill countersink specifications shank diameter14 inch hex