Stammford's Cement Retainer is wire line set, high-pressure retainer constructed of drillable gray cast –iron. It can be set on tubing drill pipe coil tubing using Hydraulic Setting Tool. It has been developed mainly for isolated wellbore. Stammford provides permanent type retainer. It can be set mechanically or hydraulically. Can be converted from cement retainer to bridge plug or vice-versa. On that account, it is a two- in one product.