Half-square triangle units (HST's) are common in quilting. Check out my favorite tools for trimming HST's for fast and efficient piecing!
The Crafty Quilter
How to Trim Half Square Triangles - Suzy Quilts
Trims up to 11 sizes of half-square triangles! Easy, Efficient & Accurate method to trim and square-up half-square triangles. INSTRUCTIONS ARE PRINTED
Clearly Perfect Slotted Trimmers by New Leaf Stitches- Quilting Tool for Fabric Cutting - Quilting Template and Stencil
Chris Dodsley @mbCD: Tute: Using A Bloc-Loc To Cut Half-Square Triangle (HST) Squares
Adventures in Quilting - Tools for Half Square Triangles - Tamarinis
Scrappy Half Square Triangle Baby or Lap Quilt Pattern
Half Square Triangle Quilt Patterns
Favorite tools for trimming HST's - The Crafty Quilter
Quilt Ruler Options for Trimming Half Square Triangles (HST)
Learn to make perfect Half Square Triangles with this ruler