Bebona Adjustable Hole Saw Circle Cutter Drill Bit

Features:

Materials that can be bored:
- Veneer Plywood Wood board, Plaster-board.
- Thinasbest-slate,etc.
- Use the twist drill for boring thick wood, and the chisel end drill for thin wood.

How to use Free-Doughnut"

• Set both cutting-blades on blade-holders tightly and correctly as shown in Figures A, B and C are correct.
• To adjust the size locate the inner edges of the blade holders against the size graduation. For example number " 40 " for a 1 (40mm) dia. Hole.
• Set two blade holders at the desired graduation on the measure - bar by tightly screw - in the hex nuts using an L-shape hex wrench.
• Use the chisel end drill when boring thin wood while use the twist-drill when wood is thick.
• Before boring. Hold two sides of veneer or timber firmly by stepping on it. Then stare boring after cautiously setting the twist-drill or chisel end drill at the centre of the desired hole.   power-drill, be sure to contact the cutting blades gradually and slowly on the object to be bored. Abrupt contact of the blades on the boring object can give shock to your hands.
• When deep boring-1" (25mm) up to a maximum 2" (50mm)-is desired, use the Free-Doughnut from one side of the timber, and then start boring again from the other side until the cutting blades bore through a hole making the doughnut-shaped disc.As shown in figure
• By way of using optional measure-bar.large hole with a maximum diameter of 8 " (200mm) can be bored.