I need to use my mayhew 66000 set to make 7/16" id x 3/4" od gaskets. can i buy a 7/16" punch to fit the inner, threaded mount?

Maybe. The 7/16 punch is available separately (I searched for "mayhew 7/16"). Not sure if the 7/16 and 3/4 punches can be used together. It depends on the size range. Punches are in different size ranges depending on where they affix to the punch body. Any punch can be used with one from the next size range up.

If purchased here is the manufacturer warranty valid for defects in materials and workmanship?

Contact the manufacturer, I'm sure they will help you

Does the punch size refer to the diameter of the hole made or the diameter of the discs removed from the hollow punch?

It refers to the size hole it makes

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Mayhew Tools 66002 Hollow Punch, 27-Piece Set, Black

Mayhew Tools 66002 Hollow Punch, 27-Piece Set, Black

Product ID: 2588791

Details

Brand
Mayhew
Color
Black
Item Weight
2.9 pounds
Material
Alloy Steel
Product Dimensions
12.75"L x 11"W

🔄Dual cutting heads for concentric circles

🔒Patented locking system for quick head swaps

🛠️27 precision hollow punches

RM2834

Duties & taxes included

In stock

Sold byAmazon MalaysiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔩 Punch above your weight with Mayhew’s ultimate 27-piece hollow punch set!

BUILT TO LAST - Crafted from durable alloy steel with a lifetime warranty for peace of mind.
PRO LEVEL ACCURACY - Trusted by mechanics and DIY pros for sharp, clean cuts without hammering.
ENDLESS SIZE COMBOS - Interchangeable punches let you customize hole sizes effortlessly.
ONE STRIKE PRECISION - Dual cutting heads deliver perfect concentric circles every time.
ORGANIZED PORTABLE - Compact plastic case keeps all 27 pieces neatly stored and travel-ready.

The Mayhew 66002 Hollow Punch Set features 27 alloy steel punches ranging from 1/8" to 2" sizes, equipped with dual cutting heads for precise concentric holes. Its patented locking system allows quick and secure head changes, all housed in a durable plastic case. Designed for professionals and serious DIYers, this set offers unmatched versatility, sharpness, and a lifetime warranty, making it the go-to tool for accurate hole punching in various materials.

Specifications

ASIN	B000X35UQ8
Best Sellers Rank	#138,256 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #134 in Hole Punches
Brand	Mayhew
Brand Name	Mayhew
Color	Black
Customer Reviews	4.9 out of 5 stars 131 Reviews
Global Trade Identification Number	00045256660028
Hole Count	27
Included Components	27 PC Hollow Punch Set (SAE)
Item Dimensions L x W x H	12.75"L x 11"W x 2.13"H
Item Type Name	27 PC Hollow Punch Set (SAE)
Item Weight	2.9 pounds
Manufacturer	Mayhew Tools
Material	Alloy Steel
Material Type	Alloy Steel
Model	66002
Number of Items	1
Operation Mode	Manual
Part Number	66002
Product Dimensions	12.75"L x 11"W x 2.13"H
Sheet Count	27
UPC	733353876519 045256660028 013440020996 636123679504 787721395751 779975278966
Unit Count	1 Count
Warranty Description	Lifetime Warranty

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