A rotatable drilling shoe attachable to a section of casing that allows for drilling and casing of a well bore in a single trip. The drilling shoe includes a fixed section and a rotatable section that has a drillable bit attached thereto. The drilling shoe further includes a mechanism for inhibiting...http://www.google.com/patents/US7275605?utm_source=gb-gplus-sharePatent US7275605 - Rotatable drill shoe
