Sentence:  The <WSD>"ferrule</WSD>" is the part of the brush that connects the bristles to the handle. The type of <WSD>ferrule</WSD> often dictates the name of the brush, such as a 3-inch flat-<WSD>ferrule</WSD> or an oval-<WSD>ferrule</WSD> sash. ... The <WSD>ferrule</WSD> is attached to the handle with small nails (brads) or by crimping the <WSD>ferrule</WSD> around the handle. 
Meaning of the word marked with <WSD> tags:  The pinched metal band which holds the bristles of a paintbrush to the shaft.