2015 will mark 27 years in business for Carlson's Choke Tubes. For the last 27 years, we have been able to grow and improve our line of choke tubes. This has come from patterning tens of thousands of shells and using all different makes and models of shotguns. By examining patterns and making adjustments to things such as the parallel section, finish, and diameters, we are able to provide an affordable product that performs. Period. We provide ourselves on our customer service and encourage customers to contact us anytime they have a concern or question. We back our product with a lifetime warranty! our 20Ga speed wrench allows you to remove and insert chokes in just seconds. It is easy to operate using only your index finger and thumb. Simply tighten the black thumb knob on end of wrench and the choke can be easily removed or inserted. Works Great in the field, on your bench, or in any situation when you need to get your choke tubes out quickly.