6mm flush axle with one square end and one round end.
8mm flush axle with two round ends.
The CCM Roller Hockey Skates listed below are compatible with the Square Flush 2pc 6mm axles, spacers, and hardware.
2021 - Super Tacks AS12020 - Tacks 9370R, 9350R2018 - Tacks 9090R, 9060R2016 - Tacks 5R92, 3R92, 1R92
The CCM Roller Hockey Skates listed below are compatible with the Round Flush 2pc 8mm axles, spacers, and hardware.
2020 - Tacks 9350R2018 - Tacks 9040R2015 - JetSpeed 260R2013 - RBZ RBZ, RBZ 90, RBZ 80, RBZ 70, RBZ 60