MSD Ignition 86103 Crank Trigger KitIgnition Crank Trigger Kit Crank Trigger Kit Crank Trigger Kit; Fits Small Block Chevy; For Use w MSD 6 7 8 Series Ignition Timing Access.; 7. 0 in. Diameter; Cannot Be False Triggered; Billet Alum. Trigger Wheel; Black; SPECIFICATIONS: Color: Black Diameter (in.): 7 WARNING CA Proposition 65: Yes WARNING CA Proposition 65 Message: WARNING: Cancer and Reproductive Harm www. P65Warnings. ca. gov FEATURES: 7 in. Diameter Absolutely the most accurate way