Features: Easy to install with no tool needed, and it is make of PE material, soft and light weight, good to protect your guitar. No drilling, no screwing. just slip over the existing strap buttons, and strap locked securely in place. These strap Block provide a secure grip, ensuring your guitar remain in place during live performances or practice session. There are 20pcs guitar strap locks in black color, convenient and easy for you to replace your old or original strap locks. Suitable for most electric guitar strap, are the perfectly solution for guitarists with varying strap sizes. Specifications: Material: PE Outer diameter: about 25mm/0.98inch Hole diameter: about 10mm/0.39inch Thickness: about 3mm/0.12inch Quantity: 20pcs Package Includes: 20pcs Guitar Strap Locks Block note: Please allow 1-2cm errors due to manual measurement, make sure that you not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.