3 per side. The Kluson Contemporary Series 19:1 ratio locking tuning machine uses the more desirable rear knob locking system and is designed for usage on contemporary guitars. This design requires an individual mounting hole location offset at approximately 7 O'clock or 4 O'clock depending on left or right handed application (bass or treble side). Uses the common modern ~\frac{25}{64}~ in. (10mm) peghole with a hex head type screw-in bushing and single mounting screw. This is a 3 + 3 set of tuning machines with all mounting hardware included.