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No pilot holes required! A set of 4 slightly different sized flat drill bits that can easily dig into round molds!

This is a flat drill bit with a center guide that is fixed to a pin vice.

Unlike regular drill bits, it can dig holes with flat bottoms.
By using the center guide, you can dig neat round holes in a more precise position.

[How to use]

Firmly insert the center guide into the center of the area you want to drill. Rotate slowly clockwise with light force.Dig to the desired depth.

• Set of 4: 1.2mm, 1.3mm, 1.6mm, 1.7mm
• The shaft thickness is unified to 3mm, so you can replace it without replacing the collet chuck of the pin vise
• Comes with a case for easy storage and carrying