The unusual-looking profile of Megapro’s DoubleLok bits allows them to engage the locking mechanism in quick-change chucks, like those found on the pocket lithium screwdrivers that’re becoming so popular. The bits also feature a spring-loaded ball in the middle, which holds them into manual screwdrivers that take regular double-ended bits.
Here’s the great part: Megapro makes a whole pile of different bits, from the full gamut of straight and Phillips sizes, to tamper-resistant Torx and spanner bits, to specialty stuff like Schrader valve core removers and clutch bits. Curiously, not all of them feature the DoubleLoc design. Still, if you’ve been hunting for a double-ended security Torx bit to complete your portable toolkit, give Megapro a look.