Is there a trigger mechanism, or is it just always on when connected to air?

There is a twisting mechanism that controls airflow. This allows for variable speed and shuts off the air completely

I am looking to mount in a lathe quick change tool holder (any one know what the body OD is the blue part)

0.6250",15.87mm according to the mitututoyos, I would make a dual ring assymbly mounted to a tool post, bore the rings six .625 split one ended, drill and thread it to screw the rings closed further to grip the tool. But as always there's more than one way to go about things, I'm sure your could find a 1/2 inch boring bar holder and drill it ou55oversize and put the screws to it

It is leaking air from under the rearend holder when turned on. It does not spin. Just shoots air out of the back. Hose/hose fitting are not leaking*

I just returned one with the exac problem. Ive been working on and off for 50 years with small type air grinders but this jewel turned out to be a paste. I was Really disappointed that it didn’t represent its maker very well. One of these shouldn’t be seized just out of box, oiled and connected with correct air supply.

is this any good for use on resin counter tops?

I would say it depends on what you're doing. If you're cutting the counter tops then no but if you're etching a design I'd say sure why not.

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Astro Pneumatic Tool 218 1/8" Pencil Type Die Grinder - 56,000RPM,Black,gold,blue, 42377

Astro Pneumatic Tool 218 1/8" Pencil Type Die Grinder - 56,000RPM,Black,gold,blue, 42377

Product ID: 6194340

Details

Brand
Astro
Color
Black
Power Source
Recommended Uses For Product
Cleaning
Voltage
120

⚙️56,000 RPM max speed

🌬️Lightweight pneumatic power

🛠️1/8-inch precision collet

€ 101.65

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡️ Power, Precision, and Portability — The Pro’s Secret Weapon!

READY OUT OF THE BOX - Includes 5-foot guarded hose for immediate, hassle-free operation
FEATHERWEIGHT CHAMPION - Ultra-light 0.25 lb design reduces fatigue during extended use
VARIABLE SPEED MASTERY - Twist throttle control lets you dial in the perfect RPM every time
VERSATILE PRO GRADE TOOL - Ideal for cleaning dies, rotors, brake pads, and intricate machining
PRECISION AT LIGHTNING SPEED - Turbocharged 56,000 RPM for flawless finishing in tight spots

The Astro Pneumatic 218 Pencil Type Die Grinder delivers a blistering 56,000 RPM in a featherlight 1/8-inch collet design, engineered for precision work in tight spaces. Its twist throttle variable speed control and included 5-foot guarded hose make it a versatile powerhouse for professionals tackling die cleaning, brake maintenance, and fine machining. Trusted by aviation and fabrication pros alike, this tool combines ergonomic comfort with industrial-grade performance to elevate your workflow.

Specifications

ASIN	B000RH36WU
Best Sellers Rank	#46,170 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #15 in Power Die Grinders
Brand Name	Astro Pneumatic
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (1,095)
Global Trade Identification Number	00745227001019
Included Components	Astro Pneumatic Tool 218 1/8" Pencil Type Die Grin
Item Dimensions	5.2 x 14.5 x 19.7 inches
Item Type Name	Astro Pneumatic Tool 218 1/8" Pencil Type Die Grinder - 56, 000RPM, Black, gold, blue, 42377
Item Weight	12.8 ounces
Manufacturer	Astro Pneumatic
Manufacturer Part Number	218
Manufacturer Warranty Description	Manufacturer Warranty
Maximum Rotational Speed	56000 rpm
Minimum Speed	56000 rpm
Model Number	218
Number of Items	1
Number of Packs	1
Other Special Features of the Product	Lightweight
Power Source	pneumatic-powered
Recommended Uses For Product	Cleaning, Grinding, Polishing
Style Name	1-PACK
UPC	745227001019
Unit Count	1 Count
Voltage	120

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