ADA 孔鑽 (.059″) 1/4″ x 6-1/2″ 附旋鈕

Bought this to set ADA beads in a concrete ramp and it cut clean holes without wandering. The 6-1/2 inch length gives me plenty of reach, though I do wish the shank fit my smaller chuck.

The knob on the end makes way more difference than I expected, especially drilling a whole row of beads without my hand cramping up. Six and a half inches gives me enough reach to clear the fixture, and the holes come out clean every time.

I was worried the 1/4-inch shank wouldn't fit my older drill, but it locked in fine and the 6-1/2 inch length gives me plenty of reach for deeper holes. Cuts through cleanly without wandering, which is exactly what I needed for setting beads.