Jebs Choke Tubes High-Voltage 20GA Features JEBS High-Voltage Series Choke Tubes are designed to easily and effectively handle steel lead bismuth or any other shot you wish to shoot. The patented design gives the shooter a more consistent shot pattern a more distinctive & shortened shot-stream and incredible knock-down power for those much needed longer shots. Choke Tubes are offered in Ported as well as Non-Ported models. Jebs Choke Tubes High-Voltage 20GA Specifications Choke Tube Comparisons for JEBS Restrictions Versus Standard Factory Choke Sizes: .575 - Similar To A FULL Manufacturer: JEBS Model: High-Voltage 20GA Finish: Matte Fabric/Material: 17-4 Heat Treated Stainless Steel Gauge: 20 Choke Tube System: Remington Choke Gun Make: Remington