Designed for a quick change between piloted countersinking and screwdriving functions.Supplied with multiple drill bit sizes including 2.38mm, 2.78mm and 3.18mm.Set consists of a variety of bits including magnetic S2 steel PZ1, PZ2 and PZ3 bits.Suitable for No. 6, 8 and 10 gauge screws.Swift flip-over allowed by quick release chuck on the extension bit holder.1/4"Hex Shank fitted with a hex key for drill bit adjustment or replacement.Model No. FDS4QUICK CHANGE - 4pc Flip-over driver set designed for a quick change between piloted countersinking and screwdriving functions.DRILL SIZES - Supplied with multiple drill bit sizes including 2.38mm, 2.78mm and 3.18mm.SCREWDRIVER BITS - Set consists of a variety of bits including magnetic S2 steel PZ1, PZ2 and PZ3 bits.COUNTERSINK - Suitable for No. 6, 8 and 10 gauge screws.QUICK RELEASE CHUCK - Swift flip over allowed by quick release chuck on the extension bit holder.HEX SHANK - 1/4"Hex shank fitted with a hex key for drill bit adjustment or replacement.