High quality, Grade 5, ultra lightweight titanium hardware. 47% lighter than steel, Corrosion resistant, Reduce overall weight. Six pins are 51 grams (1.8 oz). Includes enough to mount the two front disc. Includes spring washers, C-clips and Safety Clips. Replace front and rear floating pins to save 85g (3oz). Fits CRG karts (including GP, Aluminos, Maranello, DR, Zanardi, etc.). Shoulder Dims: 14mm diameter, 9.6mm wide.