A Bard-Parker (B.P.) handle no. 3 is a reusable handle designed to hold a detachable scalpel blade. It is a common instrument used in surgery and other medical procedures that require cutting tissue.
 
The handle is typically made of stainless steel and has a rounded or flat design.
The size no. 3 refers to the specific size and shape of the handle, which is designed to accommodate a variety of scalpel blades.
 
B.P. handles are not sold with blades, and you should never reuse a scalpel blade. Scalpel blades are disposable and extremely sharp.