This 851/4 Z PH1 bit is described by the manufacturer as a "tough" bit for Phillips screws

The Magnetic Socket Bit 55 mm is made of high-quality chrome-vanadium steel and is through-hardened

Insulation Color: Red

Serie: 263P

Product Category: Bits

Bit serie 4 phillips 1/4": PH0x50mm Unit(s):Packet This 851/4 Z PH1 bitPhillips Bit: Wera 851 4 J, PH0, 50 mm The Wera 851 4 J is a Phillips screwdriver bit (PH0) with a blade length of 50 mm and a blade diameter of 2. 5 mm. The bit is designed for Phillips head screws and uses a 1 4" hexagon drive (Wera connection series 4), making it compatible with 1 4" bit holders. The product name Wera 851 4 J precisely identifies the bit type and size. In the data specification, the bit is described as "zhhart" (tough ductile),