22 Piece AF & Metric Balled Ended Hex Key Set Screwdrivers and Bits The bits are manufactured from

The bits are manufactured from S2 shock-resisting silicon steel

as can be seen from the photo

It's data is displayed on your smart phone on a free to download app

Inner socket

22 Piece AF & Metric Balled Ended Hex Key Set Screwdrivers and Bits The bits are manufactured fromAn innovative Hex key set with ball end for up to 15% more access and supplied in metric and imperial sizes in two lengths. Innovative Hex key with ball end and nylon handle. Holder converts into handy T bar for extra leverage. Metric sizes: 1. 5, 2, 2. 5, 3, 4, 5, 6, 8 & 10mm Imperial sizes x 100mm long: 1 20", 1 16", 5 64", 3 32", 7 64", 1 8", 9 64", 5 32" x 175mm long: 3 16", 7 32", 1 4", 5 16" & 3 8". Manufactured from Chrome Vanadium.