• Alloy tool steel cutter blades and center pilot drill bit.
• Graduated in metric and inch sizes.
• Adjust the size locate the inner edges of the blade holders against the size graduation.
• For cutting plywood, laminates, composite boards, plastic, rubber and other soft materials
• Don't use on steel sheet or other metals.
• Capacity:30-120mm  30-150mm   30-200mm,40-120mm,40-150mm,40-300mm.
• Maximum cutting thickness:30mm
• Sales package:  Blister Card

Capacity:

extent of boring diamteter:1-3/16"(30mm)~4-3/4"(120mm)

extent of boring thickness:1/8"(3mm)~2"(50mm)

materials that can be bored:veneer,plywood,wood board,plaster board,thin asbest slate,tec.,

use the twist drill for boring thick wood,the chisel end drill for thin wood

How to use free doughnut:

1.set both cutting blades on blade holders tightly and correctly as shown in figure a.figure b&c are incorrect

2.to adjust the size locate the inner edges of the blade holders against the size graduation,for example number 40 for a1 40mm dia. hole

3.set two blade holders at the dersired graduation on the measure bar by tightly screw in the hexnuts using L shape hex wrench

4.use the chisel end drill when boring thin wood while use the twist drill when wood is thick

5.before boring,hold two sides of veneer of timber firmly by stepping on it,then start boring after cautiously setting the twist drill of chisel end drill at the center of the desired hole,when using 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

6.when deep boring 1"(25mm) up to maximum 2"(50mm) is desired,use the free doughnut from one side of timber,and then start boring again from the other side until the cutting blades bore through a hole making doughnut shaped disc.as shown in figure i ii iii

7.by way of using optional measure bar,large hole with maximun diameter of 8"(200mm) can be bored

Cautions:

be sure to check all the hex screws are tightly screwed in before you start boring in and case before you start boring hold both side of the cutting objects firmly by two foots,when boring by power drill 1,000 R.P.M. or under is desirable