Wooden Spinner’s Reference Tool WPI Ruler

- One - 1/8” Baltic Birch plywood spinner’s reference card with a wraps per inch (WPI) section as well as twist degree section for Z and S twist. 

- Measures approximately 4.75” x 2” (28.5 cm x 5cm), perfect for popping into your project bag for an easy reference.

- Please note that the wood has unique features and may vary slightly from stock photos.