The Crupi Chromoly Pedal Shaft Set are CNC machined from 4130 chromoly and are even heat treated for extra strength. Compatible with most Crupi Caged pedals (not platform). Sold in Pairs. Features: Compatible with most Crupi Caged pedals (not platform) Not compatible with Crupi Original pedals (circa 1982-1987) Pedal shaft screw is a 1/4-28 x 3/8" button head socket screw Pedal shaft washer is a .255 ID x .497 OD x .063 thick alloy washer Specifications: Pedal Spindle Thread Size: 9/16" Weight (Pair): 6.6 oz