The burner has to be assembled before use and you will need a few tools to hand in order to do that. I have the singe burner and that has 5 bolts that need to be inserted. Two of the bolts were completely unsuited to the task and had to be replaced, so make sure you've got access to various bolts - I needed to use M4 bolts and also provide washers to attach the burner to the stand.
In use it is excellent giving plenty of heat and enirely practical. 1-star deducted because of the bolts.

Robust and sturdy. Used at Scout camp. Works well.
Be aware that it needs to be constructed using screwdriver and adjustable spanner.
Quick delivery and helpful staff.

Terrific value gas boiling ring. Robust and efficient. Great service from Jacksons!

after searches for a product for the making of sinkers found site rang Jacksons and they were very helpful and did exactly what they said they would Delivery as stated the next day even to the time window they gave. The unit is first class for my purposes plenty of weight and strength in the unit, solid