Machined from high-end aluminum, Promax Direct Mount chainrings are made to be lightweight yet extremely durable to handle the torque and stress of modern BMX racing and other single ring applications.Uses 3-bolt direct mount chainring to crank interface. Provides a lighter set up by elimating the use of a spider while remaining strong and stiff. CNC Machined from high grade 6061-T6 series aluminum for high strength while providing weight savings. Designed for use with Promax HF-3 and CK-1 cranksets, but will also fit other cranks that utilize 3-Bolt mount chainrings. Item Specifications: Tooth Count, 42, Drivetrain Speeds, Single Speed 3/32", Round or Oval, Round, Offset, 6, Material, Aluminum, Color, Black, Weight, 107, Defined Color, Black, Direct Mount Type, Direct Mount.