Cement Retainers are used for secondary cementing operations. These drillable
retainers set securely in any hardness casing. A ratchet lock ring stores the
setting force in the retainer. The one piece packing element and metal back up
rings combine for a superior seal. The case hardened, one piece slips virtually
eliminate premature setting, yet can be easily drilled out. They are available
for 4 1/2" through 20" casing.