Material: Plastic
Colour: Black
Size: 10x20mm 10x50mm 13x26mm 13x38mm 15x30mm 15x40mm 15x50mm 15x60mm 20x30mm 20x40mm 20x50mm 20x60mm 20x70mm 20x80mm 
25x38mm 25x40mm 25x50mm 25x70mm 30x40mm 30x50mm 30x60mm 30x70mm 40x60mm 40x80mm
How to measure: Caps size is determined by the external diameter of the tube.
For example: external diameter (outside size) of tube 10x20mm then size of plugs=10x20mm
Please if you not sure which size you need ask for help before you buy.

Features:
Ribbed for easy assembly and secure fitting
Great to cover sharp tube edges
Perfect to make ends safe after building
For keeping water out and stop rusting from inside
Benefits of using plastic tube inserts includes:
Offers a neat & safe finish to tube ends
Tube inserts can prevent dirt & dust ingress
Push in application for tight fit