BinEdit v2.0
(BinMapper Texture Tools)

Guides Tab

Show Guides: Toggles (x,y) scales.

Snap To Guides: Toggles the snap feature on and off.

Snap Within: [*] Pixels: Set the desired "snap to" range. What this does is when you are dragging a vertex and come within 5 pixels (default value) of a set guide position then the vertex will quickly snap to that position.