Feature: 1. Diameter: 0.6" (16mm), Fit 0.6" diameter hole; Length: 4 inch (100 mm). Made of steel selected to resist compression deformation created during the splitting process, high hardness and good toughness. 2. Used to split the hard stone, rock, granite, marble, concrete. 3. The combined expansion of a number of wedges and shims placed into a series of drilled holes that causes the stone to split. 4. The concept of these devices is that they split rocks by applying pressure from the inside to going out. 5. Use a light hammer to start tapping the wedges in sequence, firmly but without forcing, to build gradual and even pressure along the entire line of wedges & shims. Specification: Material: chromium vanadium alloy steel Size: 10.5cm / 4.1in Color: as shown Quantity: 10pcs Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-3cm measuring deviation due to manual measurement. Packing list: 10 x Wedges. Package List: 10 x Wedges