They are CNC machined for a perfect finish.
The aluminum bolt insert is designed for M10 bolts with cylindrical head and countersunk head, both of which will be completely flush with the surface of the hold. They won't protrude and damage your hand, and they won't be recessed, ruining the clean lines of your holds!
Main features
- These holds will also work perfectly with 3/8 inch bolts for our American friends.