BOSCH TITANIUM COATED STEP DRILL BIT SDT4 FOR 1/2"" & 3/4"" CONDUIT 3/8"" SHANK FEATURES SUPER HARD TITANIUM COATING LASTS UP TO 6 TIMES LONGER THAN HIGH SPEED STEEL SELF STARTING POINTS START ON CONTACT BALANCED DOUBLE FLUTE DESIGN ELIMINATES CHATTER AND VIBRATION FOR 1/2 IN. AND 1/4 IN. CONDUIT