Profile Racing Flush Mount Crank Bolts come in 3 sizes.

A. The 3/8 x 24 version for solid spindle crank sets

B. The Gun Drilled Hollow M12 x 1.25 version for our GDH spindle crank sets, and

C. The 7/16 x 20 version for the old solid SS Crank spindle.

A pair of Solid Flush Mount bolts weighs 36g, and a pair of the GDH Bolts weighs 40g / 1.4oz.

CrMo GDH Crank bolts now use 6mm allen key.