SledgeHammer Oil Tools developed the bridge plug and cement retainer with their accessories. This tool is used for isolation of wellbore. There are the two types, either it will be permanent type or retrievable type. Sledgehammer has permanent type. It may be set by mechanically or hydraulically. This tool is easily convertible in bridge plug to cement retainer and vise versa. 

These are available in 4 1/2" to 13 3/8"

Source :- https://www.sledgehammerasia.com/bridge-plug-cement-retainer/bridge-cement-retainer.html

Sledgehammer Oil Tools Pvt. Ltd

SledgeHammer is one of the leading centralizer manufacturers and API & ISO certified 14001, 18001 and, 9001 certified company known for its quality cementing products. Presently, it enjoys the reputation for being the largest manufacturer of cementing products and suppliers of offshore and onshore cementing and float apparatus in the entire Asia. This makes it the only source for quality and original equipment.SledgeHammer is a pioneer in production and designing of innovative cementing products.SledgeHammer is a manufacturer of Quality Cementing Tool, Bow Spring Centralizer, Solid Rigid Centralizers, Cement Basket, Cementing Plug, Cementing Head, Stop Collars, Float Equipments, Stage Cementing Tool, Bridge/Cement Retainer, Dopes & Compounds.