Shear pins are a great way to secure your rocket when concerned about drag separation or in a dual deployment configuration. As nylon screws, you simply use a tap to create a hole into your air frame and coupler. Our starter set includes a tap and 10 nylon screws. The reload pack has 20 screws. Available in M2 at 3/8″ long, M3 1/2″ and M4 at 1/2″” long sizes.