Professional tool for commercial or occasional use 50mm power but screwdriver set Manufactured from chrome vanadium steel for strength and durability Comes complete with screwdriver bit holder - this is suitable for use with any drill with a chuck (electric / battery or air) Also suitable for use with normal screwdriver bit holders such as ratchet screwdrivers etc... 50mm screwdriver bit so long for access into restricted awkward hard to reach areas Screwdriver bit set SET INCLUDES THE FOLLOWING - 3 x Flat headed screwdriver bits - 4mm / 6mm and 8mm - 3 x Phillips screwdriver bits - PH1 / PH2 and PH3 - 3 x Pozi screwdriver bits - PZ1 / PZ2 and PZ3 - 1 x screwdriver bit holder - total length 56mm