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JIS vs. Phillips

JIS vs. Phillips

Jan 19th 2021

JIS vs. Phillips“Japanese Industrial Standards”The most common manufactured screwdriver bit in Japan is of the JIS standard. The JIS bit tends to be more short and stout in comparison to its neighbori

Z-Series Ratchet Repair

Z-Series Ratchet Repair

Jan 11th 2021

Posted by Jim Chase

The Z-Series Ratchets can be repaired with Ko-ken Original Renew Kits We recommend using a Ko-ken screwdriver to repair our ratchets  

The New Koken 72 Tooth Ratchets

The New Koken 72 Tooth Ratchets

Jan 10th 2021

Posted by Jim Chase

Ko-ken ratchets are known for their very low backlash, small head sizes, and high torque ranges. We designed the new 72 tooth ratchet without compromising on our traditional strengths. The patent