Meshfix Spacer - Individual or Bag of 200 - 40/50mm | Steel Reinforcement | NYEs
Chair / Spacer - CoGripedia - CoGri Group Ltd
Rebar Spacers - Inform UK
Cartwheel Spacers for Reinforcing Concrete ~ Small Large Circular Wheel Supports, Range from 25 to 50mm Cover ~ Rebar (100, Cover 35mm; Bar Size 4-12mm) : Amazon.co.uk: DIY & Tools