Check out this cool little promo video featuring the Superstar Duty Cranks:
New Duty crank from Superstar with smooth axle area for no smashed ankles, regular drive (with drive bolt hole) or spline drive sprocket versions available.
Strong tubular 3-pc crank
19 mm heat treated cr-mo hollow axle, 48 spline
175 mm heat treated cr-mo arms
Very low profile, ankle-friendly arms
Weight 813g / 29 oz