10 pack of blades for an extendable/retractable razor knife. They break away in 3/8" sections.  Great for cutting away thick adhesive, broken glass, opening adhesives, V-Cutting/miter cutting adhesive tips, and gaskets/moldings.  
 
1/64" thick
11/16" tall
4 1/4" wide 
 
(wear appropriate PPE when using these blades) 
Extremely sharp, handle with care.