Clearly Perfect Slotted Trimmer B2
Trim up to 6 slotted sizes: 5" to 10" (Nine sizes). This larger ruler is used for trimming full-inch sizes only.
Other uses include square-up hour glass blocks, strip piecing of half-square triangles, strip-tube method of block construction, and fussy cutting.
This is my preferred notion for trimming both HSTs and Hourglass blocks. I LOVE this tool especially with Grippy by Odif sprayed on the back of the ruler. I give you the option to get the ruler already sprayed with Grippy from me. I will open the ruler from its packaging, remove the paper on the back and spray your ruler with Grippy. Grippy does wear off over time and can be washed off the ruler with soap and water.
If you choose to not have Grippy sprayed on the ruler, I highly recommend using caution while cutting with a rotary cutter as the ruler is slick.