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The screws fit your Honda CB400N Carbs. They are M4 x 16mm screws.  If your carb takes different lengths then please see my other auctions.  You need one set of 4 screws per carb.  The more sets you buy the cheaper they become.  

Choose what type of screws you want for your carb bowl. Philips / Cap Allen.  Then BZP / A2 Stainless.  Then buy as many packs as you need! 

Check my other auctions for other sizes. 

Always use some anti seize compound like copper grease. This helps ensure they don't seize up.  I sell it in my eBay shop.