Make trimming and squaring your half square triangles a breeze with the Clearly Perfect Slotted Trimmers.  Designed to trim your HSTs before you press with one simple alignment and just two cuts, these original size A and B trimmers will square up HSTs in half inch increments from 1.5" to 6.5".  They'll even help you take care of the dog ears.
 
Other uses include: square-up hour glass blocks, strip piecing of half-square triangles, strip-tube method of block construction and fussy cutting.
 
I absolutely love these tools and wouldn't want to make an HSTs without them!