Screwdriver bit set with extension bar 1/4 inch WITTE 312012, 32 pieces

A 1/4 inch screwdriver bit set from WITTE, reference 312012, gathers 32 pieces in one hard plastic case. The kit holds Phillips, Pozidriv and Torx bits, plus an extension bar and a square adapter. All shanks follow the 1/4 inch hex drive described in DIN ISO1173. Bits share the same 25 mm length, so working depth stays predictable. The steel is hardened to 59-61 HRC.

The transparent lid lets you read the layout without opening the tray. Each slot is fixed, so a missing bit is easy to spot and reorder. The set belongs to the WITTE Pro line and is made in Germany. It works with WITTE screwdriver handles, ratchet drivers and power screwdrivers. Repair work, panel assembly and electrical fit-out are typical daily tasks for this kit.

What the 1/4 inch screwdriver bit set WITTE 312012 contains

Bit types and quantities

Phillips, Pozidriv and Torx profiles cover most fasteners found in service work. Duplicates matter here: seven PH2 and seven PZ2 bits handle the sizes that wear first. Torx runs from T10 to T40 in six steps. A hex to square adapter turns the kit into a socket driver. The extension bar adds reach in recessed housings.

• 9 Phillips bits: 1 x PH1, 7 x PH2, 1 x PH3
• 9 Pozidriv bits: 1 x PZ1, 7 x PZ2, 1 x PZ3
• 12 Torx bits: T10, T15 x2, T20 x3, T25 x3, T30 x2, T40
• 1 adapter, 1/4 inch hex to 1/4 inch square
• 1 extension bar with 1/4 inch hex shank
• Uniform bit length of 25 mm

The spread favours assembly crews who meet the same head sizes all day. Spare PH2 and PZ2 bits keep a job running after a tip rounds off. Less common sizes stay in the tray until a specific fastener appears.

Steel, hardness and standard

Alloy steel hardened to 59-61 HRC gives the tips a defined resistance to rounding. The 1/4 inch hex shank follows DIN ISO1173, the standard covering machine-operated screwdriver bits and holders. Equal length across the set keeps the driving depth constant when profiles are swapped inside one job.

• Hardened alloy steel construction
• Tip hardness 59-61 HRC
• Hex drive to DIN ISO1173
• 25 mm length on every bit
• WITTE Pro line, made in Germany

Consistent hardness across the tray means the rarely used Torx bits behave like the frequently used PH2. That matters for shops that log tool replacement and want repeatable results.

Case and tool compatibility

The hard plastic case holds every piece in a moulded slot. A transparent lid shows the layout before opening, which speeds up size selection on site. Because each position is fixed, a lost bit is visible at a glance. Single bits can be reordered later using the component table below.

• Hard case with transparent lid
• Individual seat for each bit
• Fits WITTE screwdriver handles and ratchet drivers
• Accepts 1/4 inch hex holders on power screwdrivers
• Compact footprint for a service bag

Common applications

Assembly teams use the PH2 and PZ2 duplicates for repeated sheet metal and chipboard screws. Electricians reach for T10 to T25 when opening enclosures and terminal blocks. Furniture fitters work mainly with PZ bits and the extension bar in deep holes. Maintenance crews keep the case in a service bag for mixed fastener heads. The square adapter drives small sockets on light hardware. Cordless screwdrivers take the same shanks without an extra holder.

Catalog component table

The table below lists each item by model and quantity. Use it to reorder a single bit after wear or loss.

Ordering notes

The kit ships as one unit under reference 312012 with a 12-month warranty. Individual bits remain available, so a worn PH2 or T20 can be replaced on its own. Production takes place in Germany within the WITTE Pro line. Imported stock is supplied through the official channel.