Sheet Metal Shrinker Jaw set complete. Jaws are fully hardened and made from 4140 alloy steel. Can be used on most other brands of shrinker/stretchers. Our jaws are 1.730 W X 1.00 Thick" if your machines jaws are larger, our jaws most likely will not work. Also jaw set can be purchased with jaw retainer stamps(2) SH01-30S that fits our SH01 & SH02 series machines. Also listed in drop down menu is our SH01-30SP vapor deposited Jaw face set fopr aluminum work only, aisd in limiting surface damage. Proudly, Made in Michigan