DRILLMAN Coupling Sleeves are compatible with DRILLMAN Extension Rods, Shank Adaptors and compatible with equipments of companies like Atlas Copco and Sandvik as well. & Coupling Types – 1. Semi Bridge Coupling Sleeve 2. Full Bridge Coupling Sleeve 3. Cross Over Adaptor Thread Types – R22, R32, R38, T38, T45, T51 https://drillmanindia.com/product/coupling-sleeve/