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Ring Size Cutter

INSTRUCTIONS • USA/British Model #004-642 • Metric Model #004-643

READ FIRST

We know you are eager to use your new GRS Ring Size 

Cutter. But, PLEASE familiarize yourself with proper 

installation and operating procedures BEFORE you begin. 

Improper installation and use could damage your new ring 

cutter or cause personal injury! Thank you for buying a GRS 

product.

INSTALLATION

The ring size cutter comes with its handle moved for 

shipping. You must reposition the handle in order to use it. 

First, remove the hex-head bolt and spacer located on the 

cutter crank pin (FIG. 1). Slide the handle out and rotate the 

cutter crank pin until you can replace the handle as shown 

in FIG. 2.  Replace the hex-head bolt with spacer into the 

tapped hole in the handle and tighten.

Use the 4 metal screws provided to securely fasten the 

ring size cutter to a workbench or table top. If these screws 

are not compatible with your bench top, you must supply a 

fastener with equal or greater strength. The shearing action 

requires moderate force on the handle. The cutter must 

be secured to safely absorb this force without pulling itself 

loose from the workbench. Be certain that the ring cutter is 

mounted properly to avoid possible injury.

Most users will want to mount the ring cutter near the front of 

their bench. We suggest that you mount it back far enough 

to allow for a “catch tray” under the cutter area to collect the 

ring slugs. You might consider putting the front mounting 

screws about 6" in from the edge of your bench. (FIG. 3)

CAUTIONS

Since this tool will cut metals, it will easily cut your finger or 

most anything else you put under the cutters. You do NOT 

need to have your fingers near the cutter when actually 

making a cut. Once you are certain that the ring and cutter 

are correctly positioned, remove your fingers and smoothly 

pull the handle.

OPERATION

The ring size cutter is actually a special shearing tool. It 

works by shearing a selected size of shank material from 

the bottom of the ring. You control the amount of material 

removed by selecting the corresponding cutter size. There 

are seven cutter sizes that come with the USA / British 

ring cutter: from 1/2" to 2", in 1/4" increments. These sizes 

directly relate to ring sizes. Thus, if you want to reduce a 

ring by 1 ring size, choose the size 1 cutter. It’s that simple. 

For the metric version there are nine cutter sizes to choose 

from. Once you have chosen the cutter size, you will then 

need to correctly install the cutter for use. First lower the 

handle to its full down position. Now, loosen the adjustment 

knob (FIG. 4) by turning it counter-clockwise. Install your 

selected cutter by placing its hole over the crank pin and 

FIG. 1

FIG. 2

FIG. 3

PLEASE READ THESE 

INSTRUCTIONS AND 

SUGGESTIONS BEFORE 

USING THIS TOOL.

Shipped with handle in 

wrong position. Handle 

must be moved before 

you can use it.

This is the correct 

placement of the 

handle.

MAGNETIC 

STORAGE 

FOR CUTTERS

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