Features: brand new and high quality High-quality metal, heat treatment process, high hardness, toughness. Using Wedge and Feather Shims to split the stone, rock, granite, marble, concrete by hand. Attention: before use, please make the necessary protective measures; when the stone is about to split, keep alert. Diameter 5/8 inch (16mm), Use 1/2 inch hammer bits can be. The concept of these devices is that they split rocks by applying pressure from the inside going out. These wedges are small but can exert an amazing amount of power. Specifications: Material: Metal Total Length: 10.5cm/4.1 in for Head Length: 4cm/ 1.6 in Diameter: 1.8cm/ 0.7 in Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 10 Pack Stone Splitter