CO2 pump (y)
I have onevery similar to this but purchased for a lot more from 'Alfords, i can attest that it is good, sturdy and very useful, tend to find it comes in handy for other jobs around the house too! Tnis genuinely looks an unbranded one the same as mine...
A lot of stuff on it that isn’t needed on modern bikes. You generally just need a few Allen key sizes now, certainly not anything requiring a socket. The pedals sometimes require a spanner, but I wouldn’t use a low quality one, as it can ruin the surface and make them a nightmare to get off. You’re better off getting good quality, bike specific tools and know that when you’re 20 miles from home, they won’t let you down. More for very occasional DIY use really. Btw-Decathlon do some very good quality plastic tyre levers that clip together for space saving and they only cost s few pounds.
Cheap soft steel Allen keys can reck bolts. Park tools period.
This one looks far better tool from Ebay better tool slightly cheaper £3.59 Uk Seller with Free delivery est. in 2-3 days https://www.ebay.co.uk/itm/11-Function-Anodised-Bicycle-Bike-Multi-Tool-Allen-Keys-Screwdrivers-Chain-Tool/292446292043?_trksid=p2485497.m4902.l9144