3Pcs Guitar Metal Top Hat Tone Tuning Knobs & 1 set Bridge Double Locking System 1. Generally used to string, it is . 2. The effect of vibrato and fermata is very good. 3. It is convenient to install the strings, perfect replacement for the old one. 4. Complete accessories and great workmanship, it is a good set for yours 5. The material of bottom column and saddle the durability of product. Guitar Top Hat knob: This is a silver tone metal guitar knob, fits any split shaft pot up to 5mm. It is traditional Tele strat knobs, also used on basses Shape: Hat/bell hat colour:chrome Material:metal size: 25 x 15mm Fits any split shaft pot up to 5mm. Height: .0.5 inch/1.3 cm Diameter: .0.8 inch/21 mm (top); Hollow shaft Diameter: 0.2 inch/5 mm Bridge Double Locking System: Type: bridge colour:Silver Material:Zinc alloy + iron Package Contents: 3 x Guitar Top Hat knob 1 x tremolo crank 1 x Spring hook 1 x Hook screw 1 x string lock 2 x String lock installation screw 3 x Hook spring 2 x lift screw 1 x 3MM wrench 1 x 2.5MM wrench 1 x Pull string board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.