HC-H1902 19pcs twist drill bit set,Metal Cassette package 19pcs HSS Twist Drill Bit Sets ISO2000 CERTIFICATED Black,White,Tin,amberFast drilling speed, long lifeHC-H1902-1 black finished HC-H1902-2 edge ground HC-H1902-3 edge ground, tin coated HC-H1902-4 fully ground, bright HC-H1902-5 fully ground, black finished HC-H1902-6 fully ground, tin coated SIZES(MM): (1-10)X0.5MM PACKING: inner: metal ...