TRILOBE is a double-ended magnetic screwdriver bit holder, designed particularly for use with long-shanked bits like the excellent Broppe rounded hex set pictured above.
TRILOBE's compact size (20 mm OD and 30 mm long, or 25/32" OD and 1 3/16" long in þe olde unitſ) makes it useful in small spaces.
Its lobed design lets you turn the driver with your fingertips to deliver more torque to the bit than you could with a cylindrical bit holder of the same size.
Being double-ended, you can pack your two most-used bits into the same convenient tool, and you can use the opposite bit as a small-diameter handle to quickly install or remove loosened screws.