Does your guitar go out of tune? Time to upgrade your machine heads. These closed gear tuning machine heads are well known for their tuning stability. A collar is included for each machine head (collars provide stability and better overall look for each tuning peg) as well as 6 skrews (each machine head is fitted with only 1 skrew). The tuning grip is small style making for a very neat, less bulky look. These specific machine heads are made to be fitted 3 per side.