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:
Columbian #503/#240-1/2M3/#504/#604
 
Length: 4.625"
Height: 1.000"
Thickness: 0.500"
Bolt spacing: 3.250"
 
Comes with 5/16-18 low-profile socket head cap screws (x4)
 
**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!**