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The studs come in various lengths. I bought 3/4" thread length because they were out of stock on the 1/2" length. I used the full length in the felt w/o the recepticle and snipped off a 1/8" to thread in the stud receiver. 1/2" is the size to use but the longer ones seem to really lock into the plain felt sole. The reason the 1/2" is reccommended is the chance of a breach through the sole. I did have a slight breach after a couple uses and took out the ones that I felt under foot and ground off an eigth or so. I'm telling you these studs hold well in the sole. My partner is big and rough on korkers and they have held up for him. I far as the thread portion holding up on repeated replacements time will tell but the way they wear you may throw out the boots b/4 you replace them all. Be careful installing the studs so you don't over tighten them and strip the plastic slug. I use a controlled speed electric drill to drive them down but stop b/4 they bottom out and finish the install by hand with a 3/8 nut driver.
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