Replacement British made clutches and heavy duty axle bearing blocks.  Easy to fit - the clutch with the red insert is for the left hand side and the blue for the right hand side.  
Note - Left hand is described, as using the trolley, with it going in front of you.

If you are replacing the clutches on your trolley, it is a good idea to check that the axle bearing blocks are not worn / elongated.  
Worn bearing blocks will put undue stress on the gearbox, which may lead to premature failure of the gearbox.

The axle blocks are supplied with steel rivets, lock washers and end caps.  Easy to fit no special tools required.