These precision Rifled Choke tubes are manufactured from 304 high stress stainless steel. Each choke tube protrudes .625 to 1.3 inches from the end of the barrel depending upon which type of firearm the choke has been specifically designed for.- Right hand rifle twist, which is a 1 in 35- Matte black finishIf you are looking for improved accuracy from a smooth bore barrel, these fine choke tubes will improve your groups. Fits: Browning Invector Plus 20 Gauge