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Screwdriver Bit Wera 851/4 Z SB
The Wera 851/4 Z SB screwdriver bit is a precision Phillips PH 1 bit with a length of 152 mm and a 1/4 inch (25.4 mm) hexagonal shank. Designed to provide a stable connection with standard bit holders and screwdrivers, this bit is suited for tasks requiring reach and control. Supplied in a blister pack, it combines measured length and a common shank size for compatibility across many hand tools and bit holders.
The extended 152 mm length allows for access to recessed or hard-to-reach screws while maintaining torque transfer through the hexagonal shank. The Phillips PH 1 profile offers accurate engagement with matching screw heads to reduce cam-out. The 1/4 inch hex shank ensures a secure fit in quick-change holders and manual drivers, and the blister packaging protects the bit during storage and transport.
Insert the 1/4 inch hex shank into a compatible bit holder or screwdriver chuck until it clicks or seats firmly. Choose screws with a matching Phillips PH 1 recess to ensure proper engagement. Apply steady, axial pressure while turning to maintain contact between the bit tip and the screw head. Use the extended length to reach screws positioned deep inside assemblies, taking care to keep the tool aligned to avoid slipping or damaging the fastener.
Inspect the bit tip for wear before use and replace it if the edges are rounded or stripped. For high-torque applications, consider using an appropriately rated bit or a manual driver designed for increased torque. Store the bit in its blister or a dedicated bit holder to protect the tip and maintain dimensional accuracy.
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