The WERA 899/4/1L is a unique interchangeable screwdriver and bit set. It includes a draw-in sleeve and a multi-component Kraftform handle, which is designed to fit snugly in the hand and provide maximum comfort and precision when driving screws. The set includes four basic exchangeable tips (Phillips, Pozidriv, Torx and slotted), as well as four additional exchangeable blades and assorted, practical bit holder attachments (three in total). All pieces in the Wera 899/4/1L are constructed of high-alloyed molybdenum-vanadium steel for exceptional strength and durability. The handle has a smooth, rounded surface for a comfortable, secure grip. Additionally, the bits are precisely machined for accurate, consistent fit. The function switch on the handle allows for one-handed operation of the bit.