Description Our 3PC Countersink Bit Set features #6, #8 and #10 Countersinks. The bits pre-drill and countersink. The 1/4" Quick Change Hex Shanks allow for quick size changes. The drill bit length is adjustable to allow for precise depth control.PRODUCT DETAILS:1/8" Hex for adjusting drill bit length1/4" Quick Change Hex ShankDesigned for use in Drill Drivers