Musiclily Pro 12mmスチールギターネック取り付け用フェルール ネックジョイントブッシュとボルト エレキギター・ベース用、4セット

They do what they're supposed to, mind you these are 12mm neck ferrules while most other neck ferrules are are 14 or 15mm wide. To me the smaller size is a good thing as they fit easier in a Fender style heel.

I had an oddball neck heel shape to deal with on a guitar body this was the perfect solution. If you want a professional install use a drill press for accuracy and depth to counter sink the ferrules

These are not even neck screws!! For other people who don't know please don't use these on your guitar unless you want to damage it.Musicsilly brand is one of the worst I've seen in over 40 years.