#4 HSS Quick Change Hex Shank Step Drill Bit (3/16" - 7/8" by 1/16") sds max adapter 5 1/4-inch x 3/8-inch 14

5 1/4-inch x 3/8-inch 14 TPI

As you know

1/2" Drive 12 Point Standard Impact Socket - 1/2"

The blade’s Full Contact Arched Design with ultra hardened cutting edge provides faster cuts in fewer passes resulting in less heat build-up to deliver 5x longer cutting performance than those of standard blades

#4 HSS Quick Change Hex Shank Step Drill Bit (3/16" - 7/8" by 1/16") sds max adapter 5 1/4-inch x 3/8-inch 14Step drills have single radial concave flutes to create a perfectly round hole in metal, plastic wood and other thin materials without center punching. Constructed of industrial grade high speed molybdenum steel, heat treated and temperature for long life. Self starting tip. No center punching needed. Automatically deburrs top side of hole. Ideal for steel, copper, aluminum and other thin materials. They have a bright finish with a 1 4" quick change