Although 10mm is the standard screw length for the majority of bridges, variation is possible.
Guitar Bridge Saddle Height Screws Metric M3x8 Gold for Guitars Bridge 12pcs
Guitar Bridge Saddle Height Screws M3x4 Silver for Electric Guitars Bridge 12pcs
Musiclily Pro 12Pcs M3x8mm Stainless Steel Guitar Bridge Saddle Height Screws
Musiclily Ultra 12Pcs Nickel UNF#4-48x5/16" Guitar Bridge Saddle Height Screws
Guitar Bridge Saddle Height Screws 10mm, 12mm & Key for Squier/Mexican Strat
Guitar Bridge Saddle Height Screws, Low 8mm Stainless For Squier/Metric Strat
