6" wide by 0.735" thick bolt-on hard jaw plates are made of case-hardened steel, HRC 55-60. Ground on 4 sides. 

Height is 1.735".  

Designed for 1/2"-13 button-head socket cap screws on 3.875" x 0.94" bolt hole pattern, not included (length varies between 1" and 1.25" depending on application).  

Sold in pairs.