Browning's Midas tubes are extended beyond the barrel for easy removal and installation. No wrench is necessary. Midas tubes are made from stainless steel with durable black oxide and laser engraving. Minimum gap geometry plus high-resolution "RMS" finish reduce buildup of plastics in the shotgun bore. The longer choke reduces flyers for more uniform patterns. These tubes are specifically designed for clay targets so you will have the confidence of knowing your chokes are going to perform and pattern exactly how you want them to, every station, every condition. For Browning 20 gauge, back-bored barrels only (Invector Plus).