Slider - 2" - Black Plastic HAR2-B-300 from ByAnnie

Sliders are used for adjustable straps, allowing you to adjust the length of a strap to fit the person carrying the purse or bag.  The slider helps hold the strap together.

All of my patterns that use this hardware give directions for attaching the slider.  

These black plastic sliders are lightweight yet sturdy with an opening for a 2" strap.