Wera 056402 #2 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
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Wera Diamond Coated 851/1 BDC Phillip #2 Insert Bit, 1/4-Inch Drive

Wera 851/1 BDC Phillip #2 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; PH2 x 1".

BiTorsion Diamond Coated 1/4" hex drive Phillips insert bit, PH2 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 #: 05056402001
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 #2
Individual Tools
Diamond Finish
25-38mm (1.0-1.4 inches)
Country of Origin:
Made in Czech Republic
In Stock

13 Reviews Write a Review

  • 5

    Posted by Dan Paris on Nov 21st 2021

    really grab onto the screw and don't cam out

  • 5
    Most common use

    Posted by Hsuehshan-Huang TWJGSTLX on Jul 22nd 2021

    Good coating, non slip and reliable user experience

  • 1
    broke in two weeks

    Posted by Joseff Tabisaura on Sep 29th 2020

    I searched impact rated, diamond coated tips and this came up. It was incredible for a week, pretty good for another week (I noticed some camping out) and then broke on Monday of week 3. waste of money. Im using these in a Milwaukee m18 1/4" impact drill. These last about the same as non-impact rated bits and that is not nearly good enough. I would say that in those two weeks I drove maybe 70-100 screws. I get MULTIPLE hundreds 500+ out of my Milwaukee impact tips. So dissapointing, bummed that these broke!!

  • 4

    Posted by Chee-Keong, LOH on Aug 26th 2019

    Very supportive and coordination of our courier arrangements.

  • 5
    Best screwdriver bits ever!

    Posted by Matthew Davis 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. I May well swap all of my screwdriver bits for these.

  • 4

    Posted by Jerry Russell on Nov 30th 2017

    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 own a very large number of Wera tools and this is the first time I've felt like maybe one of their products was a little over-hyped. Don't get me wrong, the bits still work great but after trying them side by side with uncoated Wera BiTorsion bits I can't tell any difference in performance. I think this is the first time I've ever rated a Wera tool less than 5 stars. I'm giving them 4 because they work great but no better than my other, less expensive, Wera bits.

  • 4
    Gritty and great

    Posted by Ben on Jan 1st 2017

    Excellent quality.

  • 5
    The best

    Posted by ionut pinzari on Apr 24th 2016

    Can't be better

  • 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.