Titan Tools 16503 3 Piece Titanium Step Drill Bit Set  as  Unibit style 

It fits any 1/4″Hex quick release holder. Drill chuck, Screw driver gun.

#1 Step Drill Sizes :1/8″ to 1/2″

#2 Step  Drill Sizes: 1/4″ to 3/4″

#3 Step Drill Sizes:   3/16″ to 1/2″

International Buyers – Please Read:

• Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer’s responsibility.
• Please check with your country’s customs office to determine what these additional costs will be prior to bidding/buying.
• Items may ship via UPS or USPS depending on what we choose