Type: Cello Accessories/Parts: Other Product Name: Adjustone Crystal (Set of 4 Cello Adjuster Screws) Top: Preciosa (Pink Diamond) with V-cut for brilliant sparkle. Base: Crystal glass (Jet Hematite: shines with metallic coating) Button cut. Screw Diameter: M3 Confirmed to fit most cello tailpieces (e.g., Boisdal Moni, Bogaro & Clemente, Accuacoustic, Wittner, etc.) Rhinestones are used for the screw tops, and crystal glass (Jet Hematite) is incorporated into the bases. The beautifully cut bases are designed in a button shape for easy turning during tuning. They shine beautifully and sparkle. Each piece is carefully finished by hand. We support your performance with premium screws for your instrument! Please be careful when replacing the screws. The instrument and tailpiece shown in the photos are not included with the product. #Cello #adjustone