Flat drill bit for drilling round molds without pilot holes!

Drill bit capable of drilling round molds without pilot holes.
Unlike Spin Blade (without center pin) (sold separately) it can drill round molds without pilot holes.

Set of 5 drill bits of 1.0 1.5 2.0 2.5 and 3.0 mm
Capable of drilling round molds without pilot holes.
Unlike Spin Blade Spin Mold can NOT use as a chisel tool.
Shaft thickness is standardized to 3mm to save time and work to change collet chucks of pin vises.
Portable storage case included.