Kluson sell these tuners in 2 versions. The ones you are looking at fit modern Gibsons with a 10mm peg head hole and they mount using a Hexagonal threaded bushing. The other version has no collar and fit Vintage Gibsons with an 8.8 mm hole and they mount with the smaller round press in bushing.
Drop-in upgrade for Gibson style 2-hole mount 25/64" or 10mm modern peghead hole. These Tuners use a threaded hexagonal bolt bushing.
Introducing the NEW Kluson Revolution G-mount 19:1 high ratio tuning machine. Kluson has truly introduced a game changer with the traditional footprint and newly designed sealed die-cast housing. These state-of-the-art tuners are designed to directly retrofit tuners with a screw-in hex head bushing, traditional Kluson two-screw mounting pattern and modern 25/64" peghole. The vintage outline, keystone button and pinstripes pay tribute to Kluson heritage, and the brand-new housing appearance incorporates all the features the modern guitarist demands. High gear ratio guarantees silky smooth operation, fine tuning stability and no backlash all in a sealed one-piece housing that looks like it belongs in a jewelry case! All mounting hardware is included. This set is brand new in the package and was the 2015 NAMM winner of best in show! Buy with confidence, Atlantic Custom Guitars is an authorized Kluson dealer.
Gear Ratio= 19:1
String Post Overall Height= 1 3/32 in.
String Post Diameter= 6mm
String Thru Hole Ctr Height= 29/32 in.
Bushing Type= Screw-in Hex Head
Peg Hole Requirement= 25/64 in. (10mm)
Mounting Screws required = 2