You'll need a Swann Morton Handle for these! Fits the following handles: No.3, 3L, 3 Graduated, 5B, 7, 9, B3 and B3L.Used to cut fur and foam.  Please be safe for and keep your blade in a jar or similar so you aren't leaving them loose, and get a sharps bin to dispose of them

Swann Morton blades - 20 x 10A blades