Expander fitting - Tube adaptors to enable castors to be securely attached into hollow square or round table legs. Make sure you measure the internal diameter of your tube!

Expander bolt diameter size 10mm (suit 10-11mm single bolt hole castors)

Common Internal diameter (Hallow Table legs)

20-21.5 (square) 19–21.5mm (round or square)

22-25mm (square) 21.5–24mm (round or square)

25-28mm (square) 24-27mm (round or square)

29-32mm (square) 27-30mm (round or square)

Simply tighten the bolt (Alien Key) to expand for a secure,