【High Quality Material】ANGELSWROD HSS annular cutters made with super tough M2 high speed steel (HSS) for wear resistance, clean smooth cuts and superior service life 【Precise Size】11 pcs HSS core drill with Outside Diameter in inches: 7/16",1/2",9/16",11/16",5/8",3/4",13/16",7/8",15/16",1",1-1/16",1 inch cutting depth for each drill cutter 【Premium Manufacturing】CNC-machined high precision annular drill bit set with 3/4 inch Weldon shank (with 2 flats) for secure clamping and edge finish...