Screwdriver with storage for extra bits

Design for a screwdriver/ bit holder with some cool features:Knurled extra grippy exteriorSpace for ¼ hex bits: either 6x 25mm bits or 3x 50mm or combinationCap can be used as stubby driver2 cap designsSpace for optional 5mm diameter magnets at the bottom of the hex holes.DimensionsLength: 102mm (domed cap), 97mm (flat cap)Diameter: 24mm Inspired by Starrett Automatic centre punch