Jebs Choke Tubes 20ga REM 585 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. Features: Easily and effectively handles any shot you wish More consistent shot pattern More distinctive & 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