PREMIUM HSS 4341 WITH TITANIUM COATING -- Made of high-speed steel 4341 with titanium alloy coating, these drill tap bits deliver sharp cutting performance, improved wear resistance, and extended service life for reliable metalworking. | 13PCS SAE & METRIC TAP DRILL BIT SET -- Includes popular SAE and metric sizes for common screw threading applications: SAE 6-32NC, 8-32NC, 10-24NC, 10-32NC, 12-24NC, 1/4-20NC; Metric M3-M10. Complete with storage case and quick change adapter. | 4-IN-1 DRILL, TAP, DEBURR & COUNTERSINK -- Combination drill tap bits perform drilling, threading, deburring, and countersinking in one step, reducing tool changes and improves efficiency on copper, aluminum, sheet metal, mild steel, and plastic. | PRECISION THREADING WITH 1/4" HEX QUICK CHANGE SHANK -- Each bit features clear size markings for fast identification. Universal 1/4" hex shank fits most drills, impact drivers, and electric screwdrivers for fast bit changes and convenient operation. | PORTABLE SWIVEL STORAGE CASE FOR JOBSITE USE -- Swivel case keeps every tap drill bit securely organized and easy to access. Compact design makes storage and transportation simple for workshops, garages, toolboxes,