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Product Reviews

Diamond BiTorsion bits literally bite into screw heads to dramatically prevent slip (cam-out). Ideal for all applications where self-drilling and self-tapping screws are driven into high resistance materials such as hard woods and ABS plastics.

Diamond BiTorsion bits literally bite into screw heads to dramatically prevent slip (cam-out). Ideal for all applications where self-drilling and self-tapping screws are driven into high resistance materials such as hard woods and ABS plastics.
Average Customer Rating:
5 out of 5
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(2 Reviews) 2
Open Ratings Snapshot
Rating Snapshot (2 reviews)
5 stars
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2 of 2(100%)reviewers would recommend this product.
Customer Reviews for Wera 851/4BDC BiTorsion Diamond Bit PH2 x 50mm
Review 1 for Wera 851/4BDC BiTorsion Diamond Bit PH2 x 50mm
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5 out of 5
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Would you recommend this product? Yes
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Best Phillips bits you can buy
30 Jan 2014
By rwb1012
, Milton Keynes
"I've not come across bits that grip as well on Phillips screws. As the slots are tapered, it's more difficult to prevent cam-out.
They last really well too and so are good value.
This may be stating the obvious, but you must not use these with Pozidrive screws or you will damage the coating."
Review 2 for Wera 851/4BDC BiTorsion Diamond Bit PH2 x 50mm
Overall Rating: 
5 out of 5
5 out of 5
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5 out of 5
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Would you recommend this product? Yes
Overall Rating: 
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Worth every penny
24 Dec 2012
By s20mike
, Fife
"Having went through at least 4 pozi head bits renovating parts of my house from a B&D set I picked up on sale, I bought this in the Summer for the next stages.
After 5 months of medium to heavy use, it's still driving screws like a dream, and pretty much never leaves my driver."