Tapered drill bits and countersinks are made of high-quality high speed steel (HSS). Both tapered bits and countersinks are removable and adjustable. Hex collars and hex shanks fit our Rockler exclusive Insty-Driver. Nine-piece countersink set shown includes 3 countersinks with tapered drill bits perfectly matched for #6, #8 and #10 screws, a 3/8" stop collar for countersink depth, #1 and #2 Phillips bits, #1 and #2 Square Drive bits and a sturdy nylon case plus an allen wrench for all adjustments.
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