Cylinders - KESO UNION offers a variety of UNION KESO products to meet the demands of high security external applications. Cylinders are available in three different variations. Downloads Introduction - KESO (.pdf, 409 kB) K1ES / K1OS - Omega Single Cylinder - Euro or Oval K1ED / K1OD - Omega Double Cylinder - Euro or Oval K1ET / K1OT - Omega Key & Turn Cylinder - Euro or Oval K1RS - Omega Rim Cylinder K1SI - Omega Scandinavian Profile Inner Cylinder K1SO - Omega Scandinavian Profile Outer Cylinder K4ES - Omega 4000 Euro Profile Single Cylinder - External K1SC1 - Replacement Rim Cylinder - Ingersoll K1C3 / K1C75 - Replacement Cylinder - Ingersoll K4ES - Omega Euro Profile Single Cylinder K4ED - Omega Euro Profile Double Cylinder K4ET - Omega Euro Profile Key & Turn Cylinder K1RC - Omega Rim Cylinder K4ET - Omega 4000 Euro Profile Key & Turn Cylinder - External