As is always the case, no one thing is made up of only one type of screw. The only thing you can do is be prepared for every eventuality with an extensive Key or Screwdriver set.
£12.48 inc VAT £10.40 ex VAT Was: £17.99 ex VAT
£33.26 inc VAT £27.72 ex VAT Was: £40.79 ex VAT
£36.04 inc VAT £30.03 ex VAT Was: £43.19 ex VAT