The Infini-V Constriction Tool for Glassblowers by Firekist

Sold by FirekistGlass
+ $7.05 shipping
+ $7.05 shipping
In stock
Ships next business day
Arrives from the United States

Item details

Tired of your V necking tool getting dull and misshapen? I was.

Working with the same machinist that makes my stainless steel swivels, we developed the Infini-V. The V that will NOT wear like any of the traditional fixed V designs.

These sharpened stainless steel wheels rotate along with your glass, reducing wear, so that they will not wear out the way a traditional V does. Not only will they stay sharper much much longer, they will not become misshapen like traditional V's.
The Infini-V is used quite similarly to a traditional V. Hot glass can be rotated down into the space between the wheels, and as it is gently spun in this position, a constriction can be made in the glass. This constriction can then be reworked to keep a constriction in a tube, or the constriction can be used as the point at which a tube or rod can be snapped apart.
I tend to tell people to gently spin the glass one full rotation before pressing into the V, as it is so sharp, plunging into it can get your constriction out of round.

The disks on the Invini-V can be adjusted (with one hand) from almost touching, to just over 1.25 inches apart. With the wheels spread, a set constriction can be established.. something no fixed V can match.

The roller assembly can be set at different angles, allowing you to conform it better to your working style and space.

The base is Powder coated steel, measuring 3"x 4". Nice and heavy to keep the Infini-V from moving too easily.
The wheels are 2" diameter, and just under 1/16" thick stainless steel.
Four 5/8" tall feet keep the base off your bench, and also allow for leveling adjustment.
Bonus! The post on the Invini-V will fit into The Blastshield's quick release shield pocket!

The Infini-V will likely ship partially disassembled, as in one of the pictures, to reduce shipping costs. There are 2 screws, one washer, and one wingnut. Quick and easy! It comes with the allen wrench you will need to tighten the bottom screw (it also fits the yolk's screw if need be)
Please note, while adjusting the rollers, take care not to loosen the wing nuts too much. A quarter turn is all you need. The brass bushing assembly can come apart, and will definitely take two hands to put back together if the disk comes off the bushing.
Different Height posts can be requested.

Version 2.0 now in production! Sharper wheels is the most apparent improvement. A groove in the V is the other main change, which helps the alignment and assembly. Also, the nuts holding the wheels are now brass and round, giving a few more millimeters of clearance, no matter their position.

Average review
Quality tool and Shipping was fast
Jan 23, 2018 by Morchiba
Baller tool & fast shipping. A+
May 2, 2017 by Chad S
Amazing construction, packaged so nicely, shipped quickly! Need to be able to give more than five stars!!!!!
Apr 10, 2017 by Marilyn Ure
Great tool. Draws down easily, quickly and precise. Highly recommended.
Dec 24, 2016 by Mike Hurst
Sep 22, 2016 by Brandon Reed

Shipping & policies
Ships next business day
Arrives from the United States
Estimated Shipping
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Zip or postal code

We ship USPS Priority Mail.
If you are in Canada or elsewhere, and want untracked cheaper shipping, this can be done, but once I have proved I shipped the product, it is out of my control and responsibility. go ahead and email me:


I have to collect sales tax for Minnesota, USA when shipping to a Minnesota address.

Returns & exchanges

Satisfaction is guaranteed. Contact me if you want a refund. You can then ship the item back with tracking and I suggest insurance.
If I receive the item I sent, and it is not damaged due to misuse, a refund will be issued. This should be taken care of within a month.
Please contact me if you have any problems with these products! There are a few good tips I know of that may solve many problem you may have with them.