【SPEC】 Gear ratio: 6:1 Peg holes diameter required: 0.236" (6mm) String post diameter: 0.232" (5.9mm) Bushings diameter: 0.344" (8.75mm) String post length to string hole: 0.732\” (18.6mm) Weight per single machine head: 0.011lbs (5g) Weight per set of six: 0.044lbs (20g) String diameter up to 50 gauge (up to 1.3mm diameter) Includes 4 machine heads, mounting screws and bushings