11 piece set will include probes that will work with 0. 027 inch wire, (3) red straight, 45 degree, and 90 degree, (3) green straight, 45 degree, and 90 degree, (3) yellow straight, 45 degree, and (2) black alligator clips The probes are fully insulated which provides added protection The alligator provides a better way to connect, reducing the chance of a bad reading Fit type: Size Specific