Downhole Products' EXPAND-O-LIZER SS (Standard Service) is a one piece, semi-rigid bow. Manufactured from spring steel to allow for flexing when in gauge hole applications where the operator is concerned that swelling/shifting shales are present that could impede a solid blade centralized string from getting to T.D.


  • Non-welded, robust one piece design
  • Suitable for rotation due to axial rigidity
  • Restoring forces up to 3 times greater than API
  • Spring steel flexible design significantly reduces running forces and allows easy passage through wellbore obstructions
  • Gauge hole OD offering maximum standoff
  • Suitable for onshore installation reducing rig time costs and HSE exposure


  • Centralizer placement / T&D analysis available
  • Dedicated engineering support team
  • Sizes range from 2-7/8” through 20”

For specifications, application solutions, and EXPAND-O-LIZER SS availability, please contact your local Downhole Products representative.