GO! Qube 12" Companion Set - Corners. 55787 Use with GO! Qube 12" Block to make 12" finished blocks. You must own a GO! Qube Mix & Match Set before adding the same-sized companion set. This Corners set includes four GO! Dies that work with existing GO! Qube Mix & Match Sets: Chisels, Signature Block, Bowtie, Half Square Triangle. Also includes cutting mat & storage box, instructional DVD & pattern book, 10 free patterns.