All jaws come standard made from A2 Tool Steel, heat treated to 55~ Rockwell
**I offer other options as well: smooth tool steel, solid aluminum, solid brass, solid bronze, solid copper. Price varies depending on materials used; contact me for more information**
 
These fit the following models:
Rock Island #577 (UNCONFIRMED - CHECK MEASUREMENTS)
 
Length: 6.025"
Height: 1.750"
Thickness: 0.750"
Bolt spacing: 4.000"
 
Comes with 5/16-18 low-profile socket head cap screws (x6)
 
**Jaws are usually stocked but sometimes must be made-to-order if I am running low. Your order will be created and shipped on a first come, first serve basis. Thank you!**