no knurling?
Even with 25 percent off, seems like other retailers are still less.
DRPD-am I missing another source to feed me bad habit

Yep, that's why I will stick with AmazonJP, way cheaper.Even with 25 percent off, seems like other retailers are still less.
Z series extensions don’t have the knurling but you could always throw a 1/2” knurled spinner right behind it or they have an awesome little 1/2” 35mm knurled extension if you don’t want the spinner diameter.no knurling?
Z series extensions don’t have the knurling but you could always throw a 1/2” knurled spinner right behind it or they have an awesome little 1/2” 35mm knurled extension if you don’t want the spinner diameter.
I’ve been using them lately and love them. I also recently started using Stahlwille locking extensions with the tiny button on them. While I have Z series extensions as well, I’ve decided that when I don’t need the knurled extension for what I’m doing, I’m reaching for the locking Stahlwille.Huge fan on Koken standard extensions cause of the knurling, have full set in 1/4 and 3/8. Z-series extensions missing knurling is a major miss in my opinion.
Reviving an old thread to updated 2026.
KOKEN USA Memorial Day sale 25% off with free shipping over $25.
I needed to upgrade my rubber insert Craftsman spark plug sockets, 5/8 and 13/16. So I placed an order for the clip type
Just FYI on the Koken USA Sale, check what you are buying from Koken USA against Harry Epstein (HE) https://www.harryepstein.com/collections/koken..I had a list of items I wanted from Koken and noted some items were cheaper at HE using the KOKEN discount code and including shipping. Though some items were not available from HE.Reviving an old thread to updated 2026.
KOKEN USA Memorial Day sale 25% off with free shipping over $25.
I needed to upgrade my rubber insert Craftsman spark plug sockets, 5/8 and 13/16. So I placed an order for the clip type