The small krimps are to be used with materials from 0.43mm to 0.6mm and the large are to be used with materials between 0.6mm and 0.7mm. The use of the Krimping will make getting the length of your rigs the same every time nice and easy, something which can be very important when looking for consistency.To be used in conjunction with the Korda Krimping Tool. CANNOT be used on IQ.