Includes: 4 corner units, 4 1in, 4 2in, 4in & 4 8in pieces that snap together like a puzzle piece. Lets you build a square from 4" up to 24 1/2"; the inside of the square is in whole numbers. The outside is in 1/2in increments.

Newly added is Karen Kay Buckley's Adapter! The adapter allows you to make the interior square adjustable from 5-1/2in up to 21-1/2in and the exterior square adjustable from 11in up to 26in, whole numbers.

You can easily use your rotary cutter along the outside of these acrylic pieces.

Also included is a red felt pouch to store all of your pieces.