7075 aluminum thread ring and spacer preload collar for adjusting tension on bottom bracket bearings for 30mm and DUB spindle cranks Fits: eeWing 30mm spindle, Race Face Cinch 30mm spindles, SRAM 30mm spindle, SRAM 28.99 Dub spindles 30mm and 28.99mm threaded inner rings included. Use silver thread ring for DUB cranks. Use gold thread ring for 30mm cranks Grade 5 titanium 2.5mm hex fastening bolt