TLTIC Les Trem in chrome finish. It can be easily installed on a Les Paul like the one in the fourth photo. I threw away the instructions and box, but it didn't require any particularly difficult operations. Just like when changing strings, remove the regular bridge, attach this product, and thread the strings through. The screws are shaped like the ones in the second photo, so please prepare a flathead screwdriver or similar to turn them for installation. It's a simple product, but I was very satisfied because I could play with the arm properly. If you'd like to add a tremolo arm to your Les Paul, please consider purchasing! - Model: TLTIC Les Trem - Color: Chrome Thank you for looking.