6mm flush axle with one square end and one round end.
The Alkali Roller Hockey Skates listed below are compatible with the Square Flush 2pc 6mm axles, spacers and hardware.
2021 - Revel 4, 5, 62020 - Revel 1, 2, 3, 42016 - RPD Zenith+, Visium, Rival+ 2014 - RPD Max+, Shift+, Team+, Comp+, Crew+, Lite+ (Not Adjustable)2013 - RPD Max, Shift, Team, Comp, Crew, Lite (Not Adjustable)2012 - Alkali CA9 RPD, CA9, CA7, CA5, CA4, CA3