Wera 056400 #1 x 25mm Phillips BiTorsion Diamond Coated Bit

NOTE: The product title and description supersede the image shown. The picture provided by the manufacturer is not always exact. We may use the same image for multiple sizes of an item.


List Price: $3.89
Stock Status:
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Wera Diamond Coated 851/1 BDC Phillip #1 Insert Bit, 1/4-Inch Drive

Wera 851/1 BDC Phillip #1 bit for 1/4" hex drive is designed to significantly extend the life of the bit. BiTorsion Diamond Coated (BDC) bits ensure safe working, especially driving screws into delicate materials or high-quality surfaces. Diamond coated bits _bite" into the fastener ensuring a secure fit and reducing cam-out effect, extending the life of the tool. Wera BiTorsion bits have a specially tempered torsion zone that diverts impact away from drive tip reducing the risk of breakage and extending bit life. BiTorsion bit holder in conjunction with BiTorsion bits significantly extends the bit service life. German engineered. Bit dimension: 1/4" hex drive; PH1 x 1".

BiTorsion Diamond Coated 1/4" hex drive Phillips insert bit, PH1 x 1"

BDC diamond coated bits "bite" into fastener ensuring a secure fit and reduce cam-out effect

Special tempered zone reduces risk of breakage and significantly extends life of bit

Partner with BiTorsion bit holder for optimal performance

Manufacturer Part #: 05056400001
All Wera professional hand tools are covered by a lifetime warranty against breakage due to defects in materials or workmanship for the normal life of the product. This policy does not cover products which have been altered in any way, and products which have been subject to abuse, misuse, negligence, or improper storage. Bits, bitholders and L-keys are also not covered under this warranty policy as they are considered consumable. Wera Tools reserves the right to inspect warranty claims before replacements are issued. Return transportation costs are not included, however Wera will send replacement tools at no cost. Any claims for reasons other than those noted here must be approved by Wera Tools Inc. All returns are subject to inspection prior to replacement.

All Wera tools must be sent to Wera for warranty claims. Use the following link to start this process.
Submit warranty claim here
Impact Rated
Phillips #1
Individual Tools
Diamond Finish
25-38mm (1.0-1.4 inches)
Country of Origin:
Made in Czech Republic
In Stock

6 Reviews Write a Review

  • 5
    Best screwdriver bits ever!

    Posted by Matthew on Feb 10th 2019

    Excellent, as an aircraft mechanic I used to have to use EZ grip or something similar to increase grip for stuck screws. However with the diamond grit added I don't have to worry about it anymore. I used to use Snap on ACR bits but these are far superior at a better price. As a bonus the gold color and red sizing band make them easier to find in the event of a lost tool (FOD prevention). Overall I can't recommend highly enough.

  • 4
    Wrong photo?

    Posted by Jerry Russell on Nov 30th 2017

    I ordered a set of these in #1, #2, and #3. The #2 and #3 both have the red easy identification size band on them but the #1 came with the plain green band that simply says Wera. When I searched for this part number at Wera's site it showed the green band so I'm guessing the photo here is incorrect. Regardless of the ID band I've found that I can't tell the difference between these Wera bits and the straight BiTorsion without the diamond coating. In fact the only way I knew these were BiTorsion Diamond Coated was the BDC stamped on the base. The diamond coating isn't nearly and pronounced as in the photos. I'm giving them 4 starts because they still work great but after trying them on several types of screw (even wet ones) I can't tell any difference in "bite" then my other Wera bits.

  • 4
    Looked a little smaller than a standard #1, but fine.

    Posted by Ben on Jan 2nd 2017

    Actual bit dimensions differed from photo rendering.

  • 5
    Perfect add-on to the Wera Kraftform Kompakt 27

    Posted by Keith on Feb 1st 2016

    The bits that come with the Wera Kompakt 27 are pretty good, but these are far better. More grip and no distortion of the bit or screw head. Combining this bit and others of the same series with that driver, I have a no-compromise multi-bit driver for my tool bag.

  • 5
    Excellent bits

    Posted by Grant Grein, Jr. on Dec 3rd 2014

    These bits are of high quality and will outlast your usual bits that you get from the store.

  • 5

    Posted by Jermerll Ford on Feb 17th 2014

    I LOOOOVE this bit!!!! Felt like a kid in a candy store when it arrived!!