QRT Maglock Modular Screwdriver Organizers N55 Optional Spacers added 10 Piece kit comes with 10 driver holders 5 piece spacer kit comes with 5 spacers Order accordingly New Spacer Block for those looking for more versatility and one side all handles option gives 26mm of spacing between center of driver holders for most efficient use of comfort grips and hard handles. Strong enough to hold them to the lid or side of your toolbox!11mm Diameter Contoured Seat accepts up to P4 Screwdrivers. Large and Powerful N55 Block Magnets are printed inside the block themselves, never making metal to metal contact thus protecting your toolbox/surface finish and never worrying about magnets coming loose. Important Notes All QRT Products are Proudly Manufactured here in the USA using Globally Sourced Materials. Using only the best, Current and state of the art Bambu Lab 3D Printers. Thanks for supporting our small home business. NO TOOLS INCLUDED.