Fitting any quick change system including Festool's Centrotec, the 1/4" hex shank has a double groove and is compatible with all makes of tools. The UJK top quality stepped drill bit is designed for use with pocket hole jigs. UJK design and quality gives the combined benefits of high performance for fast, clean results with an extended tool life for long service. The parabolic flute design rapidly clears waste from your pocket hole jig. Suitable for UJK Technology, Trend and Kreg pocket hole jigs. Made in Austria.