Screwdriver bit Wera 851/1 BDC SB — 1 pc, 25 mm length, 2 mm metric hex & Phillips, 1/4" (6.35 mm) hex shank

The Wera 851/1 BDC SB is a single 25 mm screwdriver bit combining a 2 mm metric hex tip and a Phillips profile on a 1/4" (6.35 mm) hex shank. Intended for use with bit holders, manual screwdrivers with bit receptacles and power drivers, this compact bit is built to provide accurate engagement in small fasteners commonly found in electronics, precision assembly and general repair work.

Advantages

The bit's short 25 mm length minimizes wobble and improves control during delicate operations. Its 1/4" hex shank ensures a secure fit in standard bit holders and quick-change chucks, reducing slip and enhancing torque transfer. The combination of a metric 2 mm hex and a Phillips profile on one bit reduces the need to switch tools when working with mixed fasteners. Manufactured by an established brand, the bit is designed for consistent tip geometry to provide reliable insertion and reduced cam-out.

Suitable for

• Precision electronics assembly and repair
• Small appliance and device maintenance
• General light- to medium-duty fastening and dismantling
• Work requiring quick bit changes and compact tool access

Key specifications

• Bit length: 25 mm
• Tip types: 2 mm metric hex and Phillips profile
• Shank type: 1/4" (6.35 mm) hex shank
• Quantity: 1 piece
• Intended use: compatible with manual and powered bit drivers

How to use

Insert the 1/4" hex shank into a compatible bit holder or driver chuck until it seats securely. Select the appropriate tip (2 mm hex or Phillips) for the fastener head and align the tip with the fastener. Apply steady, axial pressure and turn the driver at controlled speed; when using a power driver, set torque and speed to match the fastener material and size to avoid cam-out or damage. Remove the bit by pulling or releasing the quick-change mechanism on the holder.

Usage recommendations

For best results, use the bit within its intended torque range for small fasteners and check tip condition periodically; worn or rounded tips reduce engagement and can damage screw heads. Store the bit in a dry place and use with suitable bit holders to maintain secure retention and consistent performance.