Here is a plastic tube containing 12 drill bits all the same size.

You know you're going to break a drill bit, so here is a way to have more on hand for less money.

Size is #78, .0160", .406mm.

• 12-piece pack of fine high speed steel drill bits
• Includes drills #78.
• Used with: wood, resin, jewelry, walnut, amber, beeswax, olive nut, beads, PVC, acrylic, plastic, and more.
• These high quality drills are strong and useful additions to any individuals workshop. 
• Drills come in a plastic tube pack
• Fits with Excel's Pin Vise 70003 found here.

Package contains twelve #78 drill bits, by Excel.