JEBS High-Voltage 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. Features: Handles steel, lead, bismuth or any other shot More Consistant shot pattern More distinctive and shortened shot stream Incredible knock-down power Made in the USA Choke Tube Comparisons for JEBS Restrictions Versus Standard Factory Choke Sizes: .570 - Similar To A EXTRA FULL .575 - Similar To A FULL .580 - Similar To A MODIFIED .585 - Similar To A LIGHT MODIFIED .590 - Similar To A IMPROVED