The Promax SQ-1 aluminum crank arms are cold-forged from 6061-T6 aluminum and fit on square spindle type bottom brackets.

SPECS:SPINDLEFIT: For square spindle bottom brackets onlyMATERIAL: Cold-Forged 6061-T6 aluminumBOTTOMBRACKET: Sold separately (Square spindle type required)CHAINRING: Standard 5-bolt chainring (110mm bolt pattern)PEDAL FIT: 9/16″ (standard for 3pc cranks)INCLUDES: Right and Left crank armsWeight:135mm: 17.5oz/498g155mm: 18.8oz/534g165mm: 19.5oz/551g170mm: 20.2oz/572g